blob: a361500f1fc185f90d66fd1689c75bfd8185303c [file] [log] [blame]
djm@openbsd.org001aa552018-04-10 00:10:49 +00001/* $OpenBSD: ssh.c,v 1.476 2018/04/10 00:10:49 djm Exp $ */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002/*
Damien Miller95def091999-11-25 00:26:21 +11003 * Author: Tatu Ylonen <ylo@cs.hut.fi>
4 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5 * All rights reserved
Damien Miller95def091999-11-25 00:26:21 +11006 * Ssh client program. This program can be used to log into a remote machine.
7 * The software supports strong authentication, encryption, and forwarding
8 * of X11, TCP/IP, and authentication connections.
9 *
Damien Millere4340be2000-09-16 13:29:08 +110010 * As far as I am concerned, the code I have written for this software
11 * can be used freely for any purpose. Any derived versions of this
12 * software must be clearly marked as such, and if the derived work is
13 * incompatible with the protocol description in the RFC file, it must be
14 * called by a name other than "ssh" or "Secure Shell".
15 *
16 * Copyright (c) 1999 Niels Provos. All rights reserved.
Darren Tucker0a118da2003-10-15 15:54:32 +100017 * Copyright (c) 2000, 2001, 2002, 2003 Markus Friedl. All rights reserved.
Damien Millere4340be2000-09-16 13:29:08 +110018 *
19 * Modified to work with SSL by Niels Provos <provos@citi.umich.edu>
20 * in Canada (German citizen).
21 *
22 * Redistribution and use in source and binary forms, with or without
23 * modification, are permitted provided that the following conditions
24 * are met:
25 * 1. Redistributions of source code must retain the above copyright
26 * notice, this list of conditions and the following disclaimer.
27 * 2. Redistributions in binary form must reproduce the above copyright
28 * notice, this list of conditions and the following disclaimer in the
29 * documentation and/or other materials provided with the distribution.
30 *
31 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
32 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
33 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
34 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
35 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
36 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
37 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
38 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
39 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
40 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Damien Miller95def091999-11-25 00:26:21 +110041 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100042
43#include "includes.h"
Damien Millercd4223c2006-03-15 11:22:47 +110044
Damien Millerf17883e2006-03-15 11:45:54 +110045#include <sys/types.h>
46#ifdef HAVE_SYS_STAT_H
47# include <sys/stat.h>
48#endif
Damien Millercd4223c2006-03-15 11:22:47 +110049#include <sys/resource.h>
Damien Miller17e91c02006-03-15 11:28:34 +110050#include <sys/ioctl.h>
Damien Millere3b60b52006-07-10 21:08:03 +100051#include <sys/socket.h>
Damien Miller857b02e2010-09-24 22:02:56 +100052#include <sys/wait.h>
Damien Miller03e20032006-03-15 11:16:59 +110053
Damien Millerc7b06362006-03-15 11:53:45 +110054#include <ctype.h>
Darren Tuckerba724052006-07-12 22:24:22 +100055#include <errno.h>
Damien Miller57cf6382006-07-10 21:13:46 +100056#include <fcntl.h>
Damien Millerb8fe89c2006-07-24 14:51:00 +100057#include <netdb.h>
Damien Miller6645e7a2006-03-15 14:42:54 +110058#ifdef HAVE_PATHS_H
Damien Miller03e20032006-03-15 11:16:59 +110059#include <paths.h>
Damien Miller6645e7a2006-03-15 14:42:54 +110060#endif
Damien Miller9f2abc42006-07-10 20:53:08 +100061#include <pwd.h>
Damien Miller6ff3cad2006-03-15 11:52:09 +110062#include <signal.h>
Damien Millerded319c2006-09-01 15:38:36 +100063#include <stdarg.h>
Damien Miller2d00e632006-07-24 13:53:19 +100064#include <stddef.h>
Damien Millera7a73ee2006-08-05 11:37:59 +100065#include <stdio.h>
Damien Millere7a1e5c2006-08-05 11:34:19 +100066#include <stdlib.h>
Damien Millere3476ed2006-07-24 14:13:33 +100067#include <string.h>
Damien Millere6b3b612006-07-24 14:01:23 +100068#include <unistd.h>
deraadt@openbsd.org087266e2015-01-20 23:14:00 +000069#include <limits.h>
djm@openbsd.org65c6c6b2016-07-17 04:20:16 +000070#include <locale.h>
Damien Millereba71ba2000-04-29 23:57:08 +100071
Darren Tucker46aa3e02006-09-02 15:32:40 +100072#include <netinet/in.h>
73#include <arpa/inet.h>
74
Damien Miller1f0311c2014-05-15 14:24:09 +100075#ifdef WITH_OPENSSL
Damien Millereba71ba2000-04-29 23:57:08 +100076#include <openssl/evp.h>
Damien Miller0bc1bd82000-11-13 22:57:25 +110077#include <openssl/err.h>
Damien Miller1f0311c2014-05-15 14:24:09 +100078#endif
Darren Tuckerbfaaf962008-02-28 19:13:52 +110079#include "openbsd-compat/openssl-compat.h"
Damien Millerb84886b2008-05-19 15:05:07 +100080#include "openbsd-compat/sys-queue.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100081
Damien Millerd7834352006-08-05 12:39:39 +100082#include "xmalloc.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100083#include "ssh.h"
Damien Miller1383bd82000-04-06 12:32:37 +100084#include "ssh2.h"
Damien Millerb96c4412010-07-02 13:34:24 +100085#include "canohost.h"
Damien Miller1383bd82000-04-06 12:32:37 +100086#include "compat.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000087#include "cipher.h"
Damien Miller9c386432014-07-03 21:27:46 +100088#include "digest.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000089#include "packet.h"
90#include "buffer.h"
Ben Lindstromc7637672001-06-09 00:36:26 +000091#include "channels.h"
Damien Millereba71ba2000-04-29 23:57:08 +100092#include "key.h"
Damien Miller994cf142000-07-21 10:19:44 +100093#include "authfd.h"
Damien Millereba71ba2000-04-29 23:57:08 +100094#include "authfile.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000095#include "pathnames.h"
Damien Miller0e220db2004-06-15 10:34:08 +100096#include "dispatch.h"
Ben Lindstrombf555ba2001-01-18 02:04:35 +000097#include "clientloop.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000098#include "log.h"
Damien Miller7acefbb2014-07-18 14:11:24 +100099#include "misc.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +0000100#include "readconf.h"
101#include "sshconnect.h"
Ben Lindstrom06b33aa2001-02-15 03:01:59 +0000102#include "kex.h"
103#include "mac.h"
Darren Tucker06f2bd82004-05-13 16:06:46 +1000104#include "sshpty.h"
Darren Tucker46bc0752004-05-02 22:11:30 +1000105#include "match.h"
Damien Miller0e220db2004-06-15 10:34:08 +1000106#include "msg.h"
Darren Tucker25f60a72004-08-15 17:23:34 +1000107#include "uidswap.h"
Damien Millerb7576772006-07-10 20:23:39 +1000108#include "version.h"
djm@openbsd.org141efe42015-01-14 20:05:27 +0000109#include "ssherr.h"
djm@openbsd.orgf9eca242015-07-30 00:01:34 +0000110#include "myproposal.h"
Damien Millerdda78a02016-12-12 13:57:10 +1100111#include "utf8.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000112
Damien Miller7ea845e2010-02-12 09:21:02 +1100113#ifdef ENABLE_PKCS11
114#include "ssh-pkcs11.h"
Ben Lindstrombcc18082001-08-06 21:59:25 +0000115#endif
Ben Lindstromc5b68002001-07-04 04:52:03 +0000116
Damien Miller3f905871999-11-15 17:10:57 +1100117extern char *__progname;
Damien Miller3f905871999-11-15 17:10:57 +1100118
Damien Millerea2c1a42011-06-03 12:10:22 +1000119/* Saves a copy of argv for setproctitle emulation */
120#ifndef HAVE_SETPROCTITLE
121static char **saved_av;
122#endif
123
Darren Tuckerd6173c02008-06-13 04:52:53 +1000124/* Flag indicating whether debug mode is on. May be set on the command line. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000125int debug_flag = 0;
126
Damien Miller21771e22011-05-15 08:45:50 +1000127/* Flag indicating whether a tty should be requested */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000128int tty_flag = 0;
129
Damien Miller1383bd82000-04-06 12:32:37 +1000130/* don't exec a shell */
131int no_shell_flag = 0;
Damien Miller1383bd82000-04-06 12:32:37 +1000132
Damien Miller5428f641999-11-25 11:54:57 +1100133/*
134 * Flag indicating that nothing should be read from stdin. This can be set
135 * on the command line.
136 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000137int stdin_null_flag = 0;
138
Damien Miller5428f641999-11-25 11:54:57 +1100139/*
Damien Millere11e1ea2010-08-03 16:04:46 +1000140 * Flag indicating that the current process should be backgrounded and
141 * a new slave launched in the foreground for ControlPersist.
142 */
143int need_controlpersist_detach = 0;
144
145/* Copies of flags for ControlPersist foreground slave */
Damien Miller21771e22011-05-15 08:45:50 +1000146int ostdin_null_flag, ono_shell_flag, otty_flag, orequest_tty;
Damien Millere11e1ea2010-08-03 16:04:46 +1000147
148/*
Damien Miller5428f641999-11-25 11:54:57 +1100149 * Flag indicating that ssh should fork after authentication. This is useful
Ben Lindstromf666fec2002-06-06 19:51:58 +0000150 * so that the passphrase can be entered manually, and then ssh goes to the
Damien Miller5428f641999-11-25 11:54:57 +1100151 * background.
152 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000153int fork_after_authentication_flag = 0;
154
Damien Miller5428f641999-11-25 11:54:57 +1100155/*
156 * General data structure for command line options and options configurable
157 * in configuration files. See readconf.h.
158 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000159Options options;
160
Ben Lindstrom14f31ab2001-09-12 17:48:04 +0000161/* optional user configfile */
162char *config = NULL;
163
Damien Miller5428f641999-11-25 11:54:57 +1100164/*
165 * Name of the host we are connecting to. This is the name given on the
166 * command line, or the HostName specified for the user-supplied name in a
167 * configuration file.
168 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000169char *host;
170
djm@openbsd.orgb7548b12017-10-23 05:08:00 +0000171/* Various strings used to to percent_expand() arguments */
172static char thishost[NI_MAXHOST], shorthost[NI_MAXHOST], portstr[NI_MAXSERV];
173static char uidstr[32], *host_arg, *conn_hash_hex;
174
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000175/* socket address the host resolves to */
Damien Miller34132e52000-01-14 15:45:46 +1100176struct sockaddr_storage hostaddr;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000177
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000178/* Private host keys. */
Ben Lindstrom1bad2562002-06-06 19:57:33 +0000179Sensitive sensitive_data;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000180
181/* Original real UID. */
182uid_t original_real_uid;
Ben Lindstromf9c48842002-06-11 16:37:51 +0000183uid_t original_effective_uid;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000184
Damien Miller1383bd82000-04-06 12:32:37 +1000185/* command to be executed */
186Buffer command;
187
Damien Miller832562e2001-01-30 09:30:01 +1100188/* Should we execute a command or invoke a subsystem? */
189int subsystem_flag = 0;
190
Damien Miller2797f7f2002-04-23 21:09:44 +1000191/* # of replies received for global requests */
Darren Tucker9f407c42008-06-13 04:50:27 +1000192static int remote_forward_confirms_received = 0;
Damien Miller2797f7f2002-04-23 21:09:44 +1000193
Damien Millerb1cbfa22008-05-19 16:00:08 +1000194/* mux.c */
195extern int muxserver_sock;
196extern u_int muxclient_command;
Damien Miller0e220db2004-06-15 10:34:08 +1000197
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000198/* Prints a help message to the user. This function never returns. */
199
Ben Lindstrombba81212001-06-25 05:01:22 +0000200static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000201usage(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000202{
Damien Miller50955102004-03-22 09:34:58 +1100203 fprintf(stderr,
djm@openbsd.orgac2e3022018-02-23 02:34:33 +0000204"usage: ssh [-46AaCfGgKkMNnqsTtVvXxYy] [-B bind_interface]\n"
205" [-b bind_address] [-c cipher_spec] [-D [bind_address:]port]\n"
206" [-E log_file] [-e escape_char] [-F configfile] [-I pkcs11]\n"
207" [-i identity_file] [-J [user@]host[:port]] [-L address]\n"
208" [-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p port]\n"
209" [-Q query_option] [-R address] [-S ctl_path] [-W host:port]\n"
210" [-w local_tun[:remote_tun]] destination [command]\n"
Damien Miller50955102004-03-22 09:34:58 +1100211 );
Darren Tuckere9a9b712005-12-20 16:15:51 +1100212 exit(255);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000213}
214
djm@openbsd.orgb7548b12017-10-23 05:08:00 +0000215static int ssh_session2(struct ssh *, struct passwd *);
216static void load_public_identity_files(struct passwd *);
Damien Miller857b02e2010-09-24 22:02:56 +1000217static void main_sigchld_handler(int);
Damien Millerb1cbfa22008-05-19 16:00:08 +1000218
Damien Miller295ee632011-05-29 21:42:31 +1000219/* ~/ expand a list of paths. NB. assumes path[n] is heap-allocated. */
220static void
221tilde_expand_paths(char **paths, u_int num_paths)
222{
223 u_int i;
224 char *cp;
225
226 for (i = 0; i < num_paths; i++) {
227 cp = tilde_expand_filename(paths[i], original_real_uid);
Darren Tuckera627d422013-06-02 07:31:17 +1000228 free(paths[i]);
Damien Miller295ee632011-05-29 21:42:31 +1000229 paths[i] = cp;
230 }
231}
232
Damien Miller13f97b22014-02-24 15:57:55 +1100233/*
234 * Attempt to resolve a host name / port to a set of addresses and
235 * optionally return any CNAMEs encountered along the way.
236 * Returns NULL on failure.
237 * NB. this function must operate with a options having undefined members.
238 */
Damien Miller0faf7472013-10-17 11:47:23 +1100239static struct addrinfo *
Damien Miller13f97b22014-02-24 15:57:55 +1100240resolve_host(const char *name, int port, int logerr, char *cname, size_t clen)
Damien Miller0faf7472013-10-17 11:47:23 +1100241{
242 char strport[NI_MAXSERV];
243 struct addrinfo hints, *res;
244 int gaierr, loglevel = SYSLOG_LEVEL_DEBUG1;
245
Damien Miller13f97b22014-02-24 15:57:55 +1100246 if (port <= 0)
247 port = default_ssh_port();
248
djm@openbsd.orgb1d38a32015-10-15 23:51:40 +0000249 snprintf(strport, sizeof strport, "%d", port);
Damien Miller1d2c4562014-02-04 11:18:20 +1100250 memset(&hints, 0, sizeof(hints));
Damien Miller13f97b22014-02-24 15:57:55 +1100251 hints.ai_family = options.address_family == -1 ?
252 AF_UNSPEC : options.address_family;
Damien Miller0faf7472013-10-17 11:47:23 +1100253 hints.ai_socktype = SOCK_STREAM;
254 if (cname != NULL)
255 hints.ai_flags = AI_CANONNAME;
256 if ((gaierr = getaddrinfo(name, strport, &hints, &res)) != 0) {
257 if (logerr || (gaierr != EAI_NONAME && gaierr != EAI_NODATA))
258 loglevel = SYSLOG_LEVEL_ERROR;
259 do_log2(loglevel, "%s: Could not resolve hostname %.100s: %s",
260 __progname, name, ssh_gai_strerror(gaierr));
261 return NULL;
262 }
263 if (cname != NULL && res->ai_canonname != NULL) {
264 if (strlcpy(cname, res->ai_canonname, clen) >= clen) {
265 error("%s: host \"%s\" cname \"%s\" too long (max %lu)",
266 __func__, name, res->ai_canonname, (u_long)clen);
267 if (clen > 0)
268 *cname = '\0';
269 }
270 }
271 return res;
272}
273
djm@openbsd.orgfc21ea92018-01-23 05:06:25 +0000274/* Returns non-zero if name can only be an address and not a hostname */
275static int
276is_addr_fast(const char *name)
277{
278 return (strchr(name, '%') != NULL || strchr(name, ':') != NULL ||
279 strspn(name, "0123456789.") == strlen(name));
280}
281
282/* Returns non-zero if name represents a valid, single address */
283static int
284is_addr(const char *name)
285{
286 char strport[NI_MAXSERV];
287 struct addrinfo hints, *res;
288
289 if (is_addr_fast(name))
290 return 1;
291
292 snprintf(strport, sizeof strport, "%u", default_ssh_port());
293 memset(&hints, 0, sizeof(hints));
294 hints.ai_family = options.address_family == -1 ?
295 AF_UNSPEC : options.address_family;
296 hints.ai_socktype = SOCK_STREAM;
297 hints.ai_flags = AI_NUMERICHOST|AI_NUMERICSERV;
298 if (getaddrinfo(name, strport, &hints, &res) != 0)
299 return 0;
300 if (res == NULL || res->ai_next != NULL) {
301 freeaddrinfo(res);
302 return 0;
303 }
304 freeaddrinfo(res);
305 return 1;
306}
307
Damien Miller0faf7472013-10-17 11:47:23 +1100308/*
djm@openbsd.org90109022015-01-16 07:19:48 +0000309 * Attempt to resolve a numeric host address / port to a single address.
310 * Returns a canonical address string.
311 * Returns NULL on failure.
312 * NB. this function must operate with a options having undefined members.
313 */
314static struct addrinfo *
315resolve_addr(const char *name, int port, char *caddr, size_t clen)
316{
317 char addr[NI_MAXHOST], strport[NI_MAXSERV];
318 struct addrinfo hints, *res;
319 int gaierr;
320
321 if (port <= 0)
322 port = default_ssh_port();
323 snprintf(strport, sizeof strport, "%u", port);
324 memset(&hints, 0, sizeof(hints));
325 hints.ai_family = options.address_family == -1 ?
326 AF_UNSPEC : options.address_family;
327 hints.ai_socktype = SOCK_STREAM;
328 hints.ai_flags = AI_NUMERICHOST|AI_NUMERICSERV;
329 if ((gaierr = getaddrinfo(name, strport, &hints, &res)) != 0) {
330 debug2("%s: could not resolve name %.100s as address: %s",
331 __func__, name, ssh_gai_strerror(gaierr));
332 return NULL;
333 }
334 if (res == NULL) {
335 debug("%s: getaddrinfo %.100s returned no addresses",
336 __func__, name);
337 return NULL;
338 }
339 if (res->ai_next != NULL) {
340 debug("%s: getaddrinfo %.100s returned multiple addresses",
341 __func__, name);
342 goto fail;
343 }
344 if ((gaierr = getnameinfo(res->ai_addr, res->ai_addrlen,
345 addr, sizeof(addr), NULL, 0, NI_NUMERICHOST)) != 0) {
346 debug("%s: Could not format address for name %.100s: %s",
347 __func__, name, ssh_gai_strerror(gaierr));
348 goto fail;
349 }
350 if (strlcpy(caddr, addr, clen) >= clen) {
351 error("%s: host \"%s\" addr \"%s\" too long (max %lu)",
352 __func__, name, addr, (u_long)clen);
353 if (clen > 0)
354 *caddr = '\0';
355 fail:
356 freeaddrinfo(res);
357 return NULL;
358 }
359 return res;
360}
361
362/*
Damien Miller0faf7472013-10-17 11:47:23 +1100363 * Check whether the cname is a permitted replacement for the hostname
364 * and perform the replacement if it is.
Damien Miller13f97b22014-02-24 15:57:55 +1100365 * NB. this function must operate with a options having undefined members.
Damien Miller0faf7472013-10-17 11:47:23 +1100366 */
367static int
djm@openbsd.orged877ef2016-07-15 00:24:30 +0000368check_follow_cname(int direct, char **namep, const char *cname)
Damien Miller0faf7472013-10-17 11:47:23 +1100369{
370 int i;
371 struct allowed_cname *rule;
372
373 if (*cname == '\0' || options.num_permitted_cnames == 0 ||
374 strcmp(*namep, cname) == 0)
375 return 0;
Damien Miller38505592013-10-17 11:48:13 +1100376 if (options.canonicalize_hostname == SSH_CANONICALISE_NO)
Damien Miller0faf7472013-10-17 11:47:23 +1100377 return 0;
378 /*
Damien Miller38505592013-10-17 11:48:13 +1100379 * Don't attempt to canonicalize names that will be interpreted by
djm@openbsd.orged877ef2016-07-15 00:24:30 +0000380 * a proxy or jump host unless the user specifically requests so.
Damien Miller0faf7472013-10-17 11:47:23 +1100381 */
djm@openbsd.orged877ef2016-07-15 00:24:30 +0000382 if (!direct &&
Damien Miller38505592013-10-17 11:48:13 +1100383 options.canonicalize_hostname != SSH_CANONICALISE_ALWAYS)
Damien Miller0faf7472013-10-17 11:47:23 +1100384 return 0;
385 debug3("%s: check \"%s\" CNAME \"%s\"", __func__, *namep, cname);
386 for (i = 0; i < options.num_permitted_cnames; i++) {
387 rule = options.permitted_cnames + i;
djm@openbsd.orge661a862015-05-04 06:10:48 +0000388 if (match_pattern_list(*namep, rule->source_list, 1) != 1 ||
389 match_pattern_list(cname, rule->target_list, 1) != 1)
Damien Miller0faf7472013-10-17 11:47:23 +1100390 continue;
Damien Miller38505592013-10-17 11:48:13 +1100391 verbose("Canonicalized DNS aliased hostname "
Damien Miller0faf7472013-10-17 11:47:23 +1100392 "\"%s\" => \"%s\"", *namep, cname);
393 free(*namep);
394 *namep = xstrdup(cname);
395 return 1;
396 }
397 return 0;
398}
399
400/*
401 * Attempt to resolve the supplied hostname after applying the user's
Damien Miller51682fa2013-10-17 11:48:31 +1100402 * canonicalization rules. Returns the address list for the host or NULL
403 * if no name was found after canonicalization.
Damien Miller13f97b22014-02-24 15:57:55 +1100404 * NB. this function must operate with a options having undefined members.
Damien Miller0faf7472013-10-17 11:47:23 +1100405 */
406static struct addrinfo *
Damien Miller13f97b22014-02-24 15:57:55 +1100407resolve_canonicalize(char **hostp, int port)
Damien Miller0faf7472013-10-17 11:47:23 +1100408{
djm@openbsd.orged877ef2016-07-15 00:24:30 +0000409 int i, direct, ndots;
djm@openbsd.org90109022015-01-16 07:19:48 +0000410 char *cp, *fullhost, newname[NI_MAXHOST];
Damien Miller0faf7472013-10-17 11:47:23 +1100411 struct addrinfo *addrs;
412
djm@openbsd.orgfc21ea92018-01-23 05:06:25 +0000413 /*
414 * Attempt to canonicalise addresses, regardless of
415 * whether hostname canonicalisation was requested
416 */
417 if ((addrs = resolve_addr(*hostp, port,
418 newname, sizeof(newname))) != NULL) {
419 debug2("%s: hostname %.100s is address", __func__, *hostp);
420 if (strcasecmp(*hostp, newname) != 0) {
421 debug2("%s: canonicalised address \"%s\" => \"%s\"",
422 __func__, *hostp, newname);
423 free(*hostp);
424 *hostp = xstrdup(newname);
425 }
426 return addrs;
427 }
428
429 /*
430 * If this looks like an address but didn't parse as one, it might
431 * be an address with an invalid interface scope. Skip further
432 * attempts at canonicalisation.
433 */
434 if (is_addr_fast(*hostp)) {
435 debug("%s: hostname %.100s is an unrecognised address",
436 __func__, *hostp);
437 return NULL;
438 }
439
Damien Miller38505592013-10-17 11:48:13 +1100440 if (options.canonicalize_hostname == SSH_CANONICALISE_NO)
Damien Miller0faf7472013-10-17 11:47:23 +1100441 return NULL;
Damien Miller13f97b22014-02-24 15:57:55 +1100442
Damien Miller0faf7472013-10-17 11:47:23 +1100443 /*
Damien Miller38505592013-10-17 11:48:13 +1100444 * Don't attempt to canonicalize names that will be interpreted by
Damien Miller0faf7472013-10-17 11:47:23 +1100445 * a proxy unless the user specifically requests so.
446 */
djm@openbsd.orged877ef2016-07-15 00:24:30 +0000447 direct = option_clear_or_none(options.proxy_command) &&
448 options.jump_host == NULL;
449 if (!direct &&
Damien Miller38505592013-10-17 11:48:13 +1100450 options.canonicalize_hostname != SSH_CANONICALISE_ALWAYS)
Damien Miller0faf7472013-10-17 11:47:23 +1100451 return NULL;
Damien Miller13f97b22014-02-24 15:57:55 +1100452
djm@openbsd.org5ee00632015-10-16 18:40:49 +0000453 /* If domain name is anchored, then resolve it now */
454 if ((*hostp)[strlen(*hostp) - 1] == '.') {
455 debug3("%s: name is fully qualified", __func__);
456 fullhost = xstrdup(*hostp);
457 if ((addrs = resolve_host(fullhost, port, 0,
458 newname, sizeof(newname))) != NULL)
459 goto found;
460 free(fullhost);
461 goto notfound;
462 }
463
Damien Miller51682fa2013-10-17 11:48:31 +1100464 /* Don't apply canonicalization to sufficiently-qualified hostnames */
Damien Miller0faf7472013-10-17 11:47:23 +1100465 ndots = 0;
466 for (cp = *hostp; *cp != '\0'; cp++) {
467 if (*cp == '.')
468 ndots++;
469 }
Damien Miller38505592013-10-17 11:48:13 +1100470 if (ndots > options.canonicalize_max_dots) {
471 debug3("%s: not canonicalizing hostname \"%s\" (max dots %d)",
472 __func__, *hostp, options.canonicalize_max_dots);
Damien Miller0faf7472013-10-17 11:47:23 +1100473 return NULL;
474 }
475 /* Attempt each supplied suffix */
476 for (i = 0; i < options.num_canonical_domains; i++) {
djm@openbsd.org90109022015-01-16 07:19:48 +0000477 *newname = '\0';
Damien Miller0faf7472013-10-17 11:47:23 +1100478 xasprintf(&fullhost, "%s.%s.", *hostp,
479 options.canonical_domains[i]);
Damien Miller13f97b22014-02-24 15:57:55 +1100480 debug3("%s: attempting \"%s\" => \"%s\"", __func__,
481 *hostp, fullhost);
482 if ((addrs = resolve_host(fullhost, port, 0,
djm@openbsd.org90109022015-01-16 07:19:48 +0000483 newname, sizeof(newname))) == NULL) {
Damien Miller0faf7472013-10-17 11:47:23 +1100484 free(fullhost);
485 continue;
486 }
djm@openbsd.org5ee00632015-10-16 18:40:49 +0000487 found:
Damien Miller0faf7472013-10-17 11:47:23 +1100488 /* Remove trailing '.' */
489 fullhost[strlen(fullhost) - 1] = '\0';
490 /* Follow CNAME if requested */
djm@openbsd.orged877ef2016-07-15 00:24:30 +0000491 if (!check_follow_cname(direct, &fullhost, newname)) {
Damien Miller38505592013-10-17 11:48:13 +1100492 debug("Canonicalized hostname \"%s\" => \"%s\"",
Damien Miller0faf7472013-10-17 11:47:23 +1100493 *hostp, fullhost);
494 }
495 free(*hostp);
496 *hostp = fullhost;
497 return addrs;
498 }
djm@openbsd.org5ee00632015-10-16 18:40:49 +0000499 notfound:
Damien Miller38505592013-10-17 11:48:13 +1100500 if (!options.canonicalize_fallback_local)
Damien Miller13f97b22014-02-24 15:57:55 +1100501 fatal("%s: Could not resolve host \"%s\"", __progname, *hostp);
502 debug2("%s: host %s not found in any suffix", __func__, *hostp);
Damien Miller0faf7472013-10-17 11:47:23 +1100503 return NULL;
504}
505
Damien Miller95def091999-11-25 00:26:21 +1100506/*
Damien Miller13f97b22014-02-24 15:57:55 +1100507 * Read per-user configuration file. Ignore the system wide config
508 * file if the user specifies a config file on the command line.
509 */
510static void
djm@openbsd.orgb7548b12017-10-23 05:08:00 +0000511process_config_files(const char *host_name, struct passwd *pw, int post_canon)
Damien Miller13f97b22014-02-24 15:57:55 +1100512{
deraadt@openbsd.org087266e2015-01-20 23:14:00 +0000513 char buf[PATH_MAX];
Damien Miller13f97b22014-02-24 15:57:55 +1100514 int r;
515
516 if (config != NULL) {
517 if (strcasecmp(config, "none") != 0 &&
djm@openbsd.orgb7548b12017-10-23 05:08:00 +0000518 !read_config_file(config, pw, host, host_name, &options,
djm@openbsd.org957fbce2014-10-08 22:20:25 +0000519 SSHCONF_USERCONF | (post_canon ? SSHCONF_POSTCANON : 0)))
Damien Miller13f97b22014-02-24 15:57:55 +1100520 fatal("Can't open user config file %.100s: "
521 "%.100s", config, strerror(errno));
522 } else {
523 r = snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir,
524 _PATH_SSH_USER_CONFFILE);
525 if (r > 0 && (size_t)r < sizeof(buf))
djm@openbsd.orgb7548b12017-10-23 05:08:00 +0000526 (void)read_config_file(buf, pw, host, host_name,
djm@openbsd.org957fbce2014-10-08 22:20:25 +0000527 &options, SSHCONF_CHECKPERM | SSHCONF_USERCONF |
528 (post_canon ? SSHCONF_POSTCANON : 0));
Damien Miller13f97b22014-02-24 15:57:55 +1100529
530 /* Read systemwide configuration file after user config. */
djm@openbsd.org957fbce2014-10-08 22:20:25 +0000531 (void)read_config_file(_PATH_HOST_CONFIG_FILE, pw,
djm@openbsd.orgb7548b12017-10-23 05:08:00 +0000532 host, host_name, &options,
djm@openbsd.org957fbce2014-10-08 22:20:25 +0000533 post_canon ? SSHCONF_POSTCANON : 0);
534 }
535}
536
537/* Rewrite the port number in an addrinfo list of addresses */
538static void
539set_addrinfo_port(struct addrinfo *addrs, int port)
540{
541 struct addrinfo *addr;
542
543 for (addr = addrs; addr != NULL; addr = addr->ai_next) {
544 switch (addr->ai_family) {
545 case AF_INET:
546 ((struct sockaddr_in *)addr->ai_addr)->
547 sin_port = htons(port);
548 break;
549 case AF_INET6:
550 ((struct sockaddr_in6 *)addr->ai_addr)->
551 sin6_port = htons(port);
552 break;
553 }
Damien Miller13f97b22014-02-24 15:57:55 +1100554 }
555}
556
557/*
Damien Miller95def091999-11-25 00:26:21 +1100558 * Main program for the ssh client.
559 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000560int
561main(int ac, char **av)
562{
djm@openbsd.org95767262016-03-07 19:02:43 +0000563 struct ssh *ssh = NULL;
djm@openbsd.org643c2ad2017-08-12 06:46:01 +0000564 int i, r, opt, exit_status, use_syslog, direct, timeout_ms;
djm@openbsd.orgfc21ea92018-01-23 05:06:25 +0000565 int was_addr, config_test = 0, opt_terminated = 0;
djm@openbsd.orgb7548b12017-10-23 05:08:00 +0000566 char *p, *cp, *line, *argv0, buf[PATH_MAX], *logfile;
567 char cname[NI_MAXHOST];
Damien Miller95def091999-11-25 00:26:21 +1100568 struct stat st;
Ben Lindstrom086cf212001-03-05 05:56:40 +0000569 struct passwd *pw;
Ben Lindstrom5ccf63a2001-09-24 20:00:10 +0000570 extern int optind, optreset;
Damien Miller4f8e6692001-07-14 13:22:53 +1000571 extern char *optarg;
Damien Miller7acefbb2014-07-18 14:11:24 +1000572 struct Forward fwd;
Damien Miller0faf7472013-10-17 11:47:23 +1100573 struct addrinfo *addrs = NULL;
Damien Miller9c386432014-07-03 21:27:46 +1000574 struct ssh_digest_ctx *md;
575 u_char conn_hash[SSH_DIGEST_MAX_LENGTH];
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000576
dtucker@openbsd.orgffb1e7e2016-02-15 09:47:49 +0000577 ssh_malloc_init(); /* must be called before any mallocs */
Darren Tuckerce321d82005-10-03 18:11:24 +1000578 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
579 sanitise_stdfd();
580
Damien Miller59d3d5b2003-08-22 09:34:41 +1000581 __progname = ssh_get_progname(av[0]);
Damien Millerf9b625c2000-07-09 22:42:32 +1000582
Damien Millerea2c1a42011-06-03 12:10:22 +1000583#ifndef HAVE_SETPROCTITLE
584 /* Prepare for later setproctitle emulation */
585 /* Save argv so it isn't clobbered by setproctitle() emulation */
586 saved_av = xcalloc(ac + 1, sizeof(*saved_av));
587 for (i = 0; i < ac; i++)
588 saved_av[i] = xstrdup(av[i]);
589 saved_av[i] = NULL;
590 compat_init_setproctitle(ac, av);
591 av = saved_av;
592#endif
593
Damien Miller5428f641999-11-25 11:54:57 +1100594 /*
Damien Miller00d9ae22010-08-17 01:59:31 +1000595 * Discard other fds that are hanging around. These can cause problem
596 * with backgrounded ssh processes started by ControlPersist.
597 */
598 closefrom(STDERR_FILENO + 1);
599
600 /*
Damien Miller5428f641999-11-25 11:54:57 +1100601 * Save the original real uid. It will be needed later (uid-swapping
602 * may clobber the real uid).
603 */
Damien Miller95def091999-11-25 00:26:21 +1100604 original_real_uid = getuid();
605 original_effective_uid = geteuid();
Damien Millera8e06ce2003-11-21 23:48:55 +1100606
Damien Miller50b9a602002-09-04 16:50:06 +1000607 /*
608 * Use uid-swapping to give up root privileges for the duration of
609 * option processing. We will re-instantiate the rights when we are
610 * ready to create the privileged port, and will permanently drop
611 * them when the port has been created (actually, when the connection
612 * has been made, as we may need to create the port several times).
613 */
614 PRIV_END;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000615
Damien Miller05dd7952000-10-01 00:42:48 +1100616#ifdef HAVE_SETRLIMIT
Damien Miller95def091999-11-25 00:26:21 +1100617 /* If we are installed setuid root be careful to not drop core. */
618 if (original_real_uid != original_effective_uid) {
619 struct rlimit rlim;
620 rlim.rlim_cur = rlim.rlim_max = 0;
621 if (setrlimit(RLIMIT_CORE, &rlim) < 0)
622 fatal("setrlimit failed: %.100s", strerror(errno));
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000623 }
Damien Millerbac2d8a2000-09-05 16:13:06 +1100624#endif
Ben Lindstrom3fcf1a22001-04-08 18:26:59 +0000625 /* Get user data. */
626 pw = getpwuid(original_real_uid);
627 if (!pw) {
Damien Miller3009d3c2013-07-20 13:22:31 +1000628 logit("No user exists for uid %lu", (u_long)original_real_uid);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100629 exit(255);
Ben Lindstrom3fcf1a22001-04-08 18:26:59 +0000630 }
631 /* Take a copy of the returned structure. */
632 pw = pwcopy(pw);
633
Damien Miller5428f641999-11-25 11:54:57 +1100634 /*
Damien Miller5428f641999-11-25 11:54:57 +1100635 * Set our umask to something reasonable, as some files are created
636 * with the default umask. This will make them world-readable but
637 * writable only by the owner, which is ok for all files for which we
638 * don't set the modes explicitly.
639 */
Damien Miller95def091999-11-25 00:26:21 +1100640 umask(022);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000641
Damien Millerdda78a02016-12-12 13:57:10 +1100642 msetlocale();
djm@openbsd.org65c6c6b2016-07-17 04:20:16 +0000643
Darren Tuckerd6173c02008-06-13 04:52:53 +1000644 /*
645 * Initialize option structure to indicate that no values have been
646 * set.
647 */
Damien Miller95def091999-11-25 00:26:21 +1100648 initialize_options(&options);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000649
djm@openbsd.orgdbee4112017-09-12 06:32:07 +0000650 /*
651 * Prepare main ssh transport/connection structures
652 */
653 if ((ssh = ssh_alloc_session_state()) == NULL)
654 fatal("Couldn't allocate session state");
655 channel_init_channels(ssh);
656 active_state = ssh; /* XXX legacy API compat */
657
Damien Miller95def091999-11-25 00:26:21 +1100658 /* Parse command-line arguments. */
659 host = NULL;
Damien Millere272a5b2008-11-03 19:22:37 +1100660 use_syslog = 0;
Damien Miller03d4d7e2013-04-23 15:21:06 +1000661 logfile = NULL;
Darren Tucker72efd742009-06-21 17:48:00 +1000662 argv0 = av[0];
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000663
Damien Miller2ecb6bd2006-03-15 12:03:53 +1100664 again:
Darren Tuckerd6173c02008-06-13 04:52:53 +1000665 while ((opt = getopt(ac, av, "1246ab:c:e:fgi:kl:m:no:p:qstvx"
djm@openbsd.orgac2e3022018-02-23 02:34:33 +0000666 "AB:CD:E:F:GI:J:KL:MNO:PQ:R:S:TVw:W:XYy")) != -1) {
Damien Miller95def091999-11-25 00:26:21 +1100667 switch (opt) {
Ben Lindstrom1e7d3062001-02-09 02:36:43 +0000668 case '1':
djm@openbsd.org99f95ba2017-04-30 23:11:45 +0000669 fatal("SSH protocol v.1 is no longer supported");
Ben Lindstrom1e7d3062001-02-09 02:36:43 +0000670 break;
Damien Miller4af51302000-04-16 11:18:38 +1000671 case '2':
djm@openbsd.org99f95ba2017-04-30 23:11:45 +0000672 /* Ignored */
Damien Miller4af51302000-04-16 11:18:38 +1000673 break;
Damien Miller34132e52000-01-14 15:45:46 +1100674 case '4':
Darren Tucker0a4f04b2003-07-03 20:37:47 +1000675 options.address_family = AF_INET;
Damien Miller34132e52000-01-14 15:45:46 +1100676 break;
Damien Miller34132e52000-01-14 15:45:46 +1100677 case '6':
Darren Tucker0a4f04b2003-07-03 20:37:47 +1000678 options.address_family = AF_INET6;
Damien Miller34132e52000-01-14 15:45:46 +1100679 break;
Damien Miller95def091999-11-25 00:26:21 +1100680 case 'n':
681 stdin_null_flag = 1;
682 break;
Damien Miller95def091999-11-25 00:26:21 +1100683 case 'f':
684 fork_after_authentication_flag = 1;
685 stdin_null_flag = 1;
686 break;
Damien Miller95def091999-11-25 00:26:21 +1100687 case 'x':
688 options.forward_x11 = 0;
689 break;
Damien Miller95def091999-11-25 00:26:21 +1100690 case 'X':
691 options.forward_x11 = 1;
692 break;
Damien Millere272a5b2008-11-03 19:22:37 +1100693 case 'y':
694 use_syslog = 1;
695 break;
Damien Miller03d4d7e2013-04-23 15:21:06 +1000696 case 'E':
dtucker@openbsd.org4f7cc2f2015-09-04 08:21:47 +0000697 logfile = optarg;
Damien Miller03d4d7e2013-04-23 15:21:06 +1000698 break;
djm@openbsd.org957fbce2014-10-08 22:20:25 +0000699 case 'G':
700 config_test = 1;
701 break;
Darren Tucker0a118da2003-10-15 15:54:32 +1000702 case 'Y':
703 options.forward_x11 = 1;
704 options.forward_x11_trusted = 1;
705 break;
Damien Miller95def091999-11-25 00:26:21 +1100706 case 'g':
Damien Miller7acefbb2014-07-18 14:11:24 +1000707 options.fwd_opts.gateway_ports = 1;
Damien Miller95def091999-11-25 00:26:21 +1100708 break;
Darren Tucker7ebfc102004-11-07 20:06:19 +1100709 case 'O':
dtucker@openbsd.org8543ff32016-06-03 03:14:41 +0000710 if (options.stdio_forward_host != NULL)
Damien Millere1537f92010-01-26 13:26:22 +1100711 fatal("Cannot specify multiplexing "
712 "command with -W");
713 else if (muxclient_command != 0)
714 fatal("Multiplexing command already specified");
Darren Tucker7ebfc102004-11-07 20:06:19 +1100715 if (strcmp(optarg, "check") == 0)
Damien Millerb1cbfa22008-05-19 16:00:08 +1000716 muxclient_command = SSHMUX_COMMAND_ALIVE_CHECK;
Damien Miller388f6fc2010-05-21 14:57:35 +1000717 else if (strcmp(optarg, "forward") == 0)
718 muxclient_command = SSHMUX_COMMAND_FORWARD;
Darren Tucker7ebfc102004-11-07 20:06:19 +1100719 else if (strcmp(optarg, "exit") == 0)
Damien Millerb1cbfa22008-05-19 16:00:08 +1000720 muxclient_command = SSHMUX_COMMAND_TERMINATE;
Damien Miller6c3eec72011-05-05 14:16:22 +1000721 else if (strcmp(optarg, "stop") == 0)
722 muxclient_command = SSHMUX_COMMAND_STOP;
Damien Millerf6dff7c2011-09-22 21:38:52 +1000723 else if (strcmp(optarg, "cancel") == 0)
724 muxclient_command = SSHMUX_COMMAND_CANCEL_FWD;
markus@openbsd.org8d057842016-09-30 09:19:13 +0000725 else if (strcmp(optarg, "proxy") == 0)
726 muxclient_command = SSHMUX_COMMAND_PROXY;
Darren Tucker7ebfc102004-11-07 20:06:19 +1100727 else
728 fatal("Invalid multiplex command.");
729 break;
Damien Miller147bba32002-09-04 16:46:06 +1000730 case 'P': /* deprecated */
Damien Miller95def091999-11-25 00:26:21 +1100731 options.use_privileged_port = 0;
732 break;
Damien Millerd937dc02013-12-05 10:19:54 +1100733 case 'Q':
Damien Millerea111192013-04-23 19:24:32 +1000734 cp = NULL;
Damien Millerd937dc02013-12-05 10:19:54 +1100735 if (strcmp(optarg, "cipher") == 0)
Damien Miller0fde8ac2013-11-21 14:12:23 +1100736 cp = cipher_alg_list('\n', 0);
Damien Millerd937dc02013-12-05 10:19:54 +1100737 else if (strcmp(optarg, "cipher-auth") == 0)
Damien Miller0fde8ac2013-11-21 14:12:23 +1100738 cp = cipher_alg_list('\n', 1);
Damien Millerd937dc02013-12-05 10:19:54 +1100739 else if (strcmp(optarg, "mac") == 0)
Damien Miller690d9892013-11-08 12:16:49 +1100740 cp = mac_alg_list('\n');
Damien Millerd937dc02013-12-05 10:19:54 +1100741 else if (strcmp(optarg, "kex") == 0)
Damien Miller690d9892013-11-08 12:16:49 +1100742 cp = kex_alg_list('\n');
Damien Millerd937dc02013-12-05 10:19:54 +1100743 else if (strcmp(optarg, "key") == 0)
djm@openbsd.org183ba552017-03-10 04:07:20 +0000744 cp = sshkey_alg_list(0, 0, 0, '\n');
Damien Miller5be9d9e2013-12-07 11:24:01 +1100745 else if (strcmp(optarg, "key-cert") == 0)
djm@openbsd.org183ba552017-03-10 04:07:20 +0000746 cp = sshkey_alg_list(1, 0, 0, '\n');
Damien Miller5be9d9e2013-12-07 11:24:01 +1100747 else if (strcmp(optarg, "key-plain") == 0)
djm@openbsd.org183ba552017-03-10 04:07:20 +0000748 cp = sshkey_alg_list(0, 1, 0, '\n');
djm@openbsd.org68d2dfc2015-03-03 06:48:58 +0000749 else if (strcmp(optarg, "protocol-version") == 0) {
djm@openbsd.org68d2dfc2015-03-03 06:48:58 +0000750 cp = xstrdup("2");
djm@openbsd.org68d2dfc2015-03-03 06:48:58 +0000751 }
Damien Millerea111192013-04-23 19:24:32 +1000752 if (cp == NULL)
753 fatal("Unsupported query \"%s\"", optarg);
754 printf("%s\n", cp);
755 free(cp);
756 exit(0);
757 break;
Damien Miller95def091999-11-25 00:26:21 +1100758 case 'a':
759 options.forward_agent = 0;
760 break;
Damien Millerb1715dc2000-05-30 13:44:51 +1000761 case 'A':
762 options.forward_agent = 1;
763 break;
Damien Miller95def091999-11-25 00:26:21 +1100764 case 'k':
Damien Millere0113cc2003-11-24 13:10:09 +1100765 options.gss_deleg_creds = 0;
Damien Miller95def091999-11-25 00:26:21 +1100766 break;
Darren Tucker415bddc2007-06-12 23:43:16 +1000767 case 'K':
768 options.gss_authentication = 1;
769 options.gss_deleg_creds = 1;
770 break;
Damien Miller95def091999-11-25 00:26:21 +1100771 case 'i':
dtucker@openbsd.org03239c12015-10-25 23:42:00 +0000772 p = tilde_expand_filename(optarg, original_real_uid);
773 if (stat(p, &st) < 0)
Damien Millerf4614452001-07-14 12:18:10 +1000774 fprintf(stderr, "Warning: Identity file %s "
dtucker@openbsd.org03239c12015-10-25 23:42:00 +0000775 "not accessible: %s.\n", p,
Damien Miller3eb48b62005-03-01 21:15:46 +1100776 strerror(errno));
dtucker@openbsd.org03239c12015-10-25 23:42:00 +0000777 else
778 add_identity_file(&options, NULL, p, 1);
779 free(p);
Damien Miller95def091999-11-25 00:26:21 +1100780 break;
Ben Lindstromc5b68002001-07-04 04:52:03 +0000781 case 'I':
Damien Miller7ea845e2010-02-12 09:21:02 +1100782#ifdef ENABLE_PKCS11
dtucker@openbsd.org4f7cc2f2015-09-04 08:21:47 +0000783 free(options.pkcs11_provider);
Damien Miller7ea845e2010-02-12 09:21:02 +1100784 options.pkcs11_provider = xstrdup(optarg);
Ben Lindstrombcc18082001-08-06 21:59:25 +0000785#else
Damien Miller7ea845e2010-02-12 09:21:02 +1100786 fprintf(stderr, "no support for PKCS#11.\n");
Ben Lindstrombcc18082001-08-06 21:59:25 +0000787#endif
Ben Lindstromc5b68002001-07-04 04:52:03 +0000788 break;
djm@openbsd.orged877ef2016-07-15 00:24:30 +0000789 case 'J':
790 if (options.jump_host != NULL)
791 fatal("Only a single -J option permitted");
792 if (options.proxy_command != NULL)
793 fatal("Cannot specify -J with ProxyCommand");
794 if (parse_jump(optarg, &options, 1) == -1)
795 fatal("Invalid -J argument");
796 options.proxy_command = xstrdup("none");
797 break;
Damien Miller95def091999-11-25 00:26:21 +1100798 case 't':
Damien Miller21771e22011-05-15 08:45:50 +1000799 if (options.request_tty == REQUEST_TTY_YES)
800 options.request_tty = REQUEST_TTY_FORCE;
801 else
802 options.request_tty = REQUEST_TTY_YES;
Damien Miller95def091999-11-25 00:26:21 +1100803 break;
Damien Miller95def091999-11-25 00:26:21 +1100804 case 'v':
Darren Tuckere98dfa32003-07-19 19:54:31 +1000805 if (debug_flag == 0) {
Damien Millere4340be2000-09-16 13:29:08 +1100806 debug_flag = 1;
807 options.log_level = SYSLOG_LEVEL_DEBUG1;
Darren Tuckere98dfa32003-07-19 19:54:31 +1000808 } else {
djm@openbsd.orged877ef2016-07-15 00:24:30 +0000809 if (options.log_level < SYSLOG_LEVEL_DEBUG3) {
810 debug_flag++;
Darren Tuckere98dfa32003-07-19 19:54:31 +1000811 options.log_level++;
djm@openbsd.orged877ef2016-07-15 00:24:30 +0000812 }
Darren Tuckere98dfa32003-07-19 19:54:31 +1000813 }
Damien Miller03d4d7e2013-04-23 15:21:06 +1000814 break;
Damien Miller95def091999-11-25 00:26:21 +1100815 case 'V':
Damien Miller0c889cd2004-03-22 09:36:00 +1100816 fprintf(stderr, "%s, %s\n",
Damien Miller1f0311c2014-05-15 14:24:09 +1000817 SSH_RELEASE,
818#ifdef WITH_OPENSSL
819 SSLeay_version(SSLEAY_VERSION)
820#else
821 "without OpenSSL"
822#endif
823 );
Damien Miller95def091999-11-25 00:26:21 +1100824 if (opt == 'V')
825 exit(0);
Damien Miller95def091999-11-25 00:26:21 +1100826 break;
Damien Millerd27b9472005-12-13 19:29:02 +1100827 case 'w':
Damien Miller7b58e802005-12-13 19:33:19 +1100828 if (options.tun_open == -1)
829 options.tun_open = SSH_TUNMODE_DEFAULT;
Damien Millerd27b9472005-12-13 19:29:02 +1100830 options.tun_local = a2tun(optarg, &options.tun_remote);
Damien Miller7b58e802005-12-13 19:33:19 +1100831 if (options.tun_local == SSH_TUNID_ERR) {
Darren Tuckerd6173c02008-06-13 04:52:53 +1000832 fprintf(stderr,
833 "Bad tun device '%s'\n", optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100834 exit(255);
Damien Millerd27b9472005-12-13 19:29:02 +1100835 }
836 break;
Darren Tucker7ad8dd22010-01-12 19:40:27 +1100837 case 'W':
dtucker@openbsd.org8543ff32016-06-03 03:14:41 +0000838 if (options.stdio_forward_host != NULL)
Damien Millere1537f92010-01-26 13:26:22 +1100839 fatal("stdio forward already specified");
840 if (muxclient_command != 0)
841 fatal("Cannot specify stdio forward with -O");
Darren Tucker7ad8dd22010-01-12 19:40:27 +1100842 if (parse_forward(&fwd, optarg, 1, 0)) {
dtucker@openbsd.org8543ff32016-06-03 03:14:41 +0000843 options.stdio_forward_host = fwd.listen_host;
844 options.stdio_forward_port = fwd.listen_port;
Darren Tuckera627d422013-06-02 07:31:17 +1000845 free(fwd.connect_host);
Darren Tucker7ad8dd22010-01-12 19:40:27 +1100846 } else {
847 fprintf(stderr,
848 "Bad stdio forwarding specification '%s'\n",
849 optarg);
850 exit(255);
851 }
Damien Miller21771e22011-05-15 08:45:50 +1000852 options.request_tty = REQUEST_TTY_NO;
Darren Tucker7ad8dd22010-01-12 19:40:27 +1100853 no_shell_flag = 1;
Darren Tucker7ad8dd22010-01-12 19:40:27 +1100854 break;
Damien Miller95def091999-11-25 00:26:21 +1100855 case 'q':
856 options.log_level = SYSLOG_LEVEL_QUIET;
857 break;
Damien Miller95def091999-11-25 00:26:21 +1100858 case 'e':
859 if (optarg[0] == '^' && optarg[2] == 0 &&
Damien Millerf4614452001-07-14 12:18:10 +1000860 (u_char) optarg[1] >= 64 &&
861 (u_char) optarg[1] < 128)
Ben Lindstrom46c16222000-12-22 01:43:59 +0000862 options.escape_char = (u_char) optarg[1] & 31;
Damien Miller95def091999-11-25 00:26:21 +1100863 else if (strlen(optarg) == 1)
Ben Lindstrom46c16222000-12-22 01:43:59 +0000864 options.escape_char = (u_char) optarg[0];
Damien Miller95def091999-11-25 00:26:21 +1100865 else if (strcmp(optarg, "none") == 0)
Ben Lindstrom2b1f71b2001-06-05 20:32:21 +0000866 options.escape_char = SSH_ESCAPECHAR_NONE;
Damien Miller95def091999-11-25 00:26:21 +1100867 else {
Damien Millerf4614452001-07-14 12:18:10 +1000868 fprintf(stderr, "Bad escape character '%s'.\n",
869 optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100870 exit(255);
Damien Miller95def091999-11-25 00:26:21 +1100871 }
872 break;
Damien Miller95def091999-11-25 00:26:21 +1100873 case 'c':
djm@openbsd.orgcdccebd2017-04-30 23:15:04 +0000874 if (!ciphers_valid(*optarg == '+' ?
djm@openbsd.orgf9eca242015-07-30 00:01:34 +0000875 optarg + 1 : optarg)) {
djm@openbsd.orgf9eca242015-07-30 00:01:34 +0000876 fprintf(stderr, "Unknown cipher type '%s'\n",
877 optarg);
878 exit(255);
879 }
djm@openbsd.orgcdccebd2017-04-30 23:15:04 +0000880 free(options.ciphers);
881 options.ciphers = xstrdup(optarg);
Damien Miller95def091999-11-25 00:26:21 +1100882 break;
Ben Lindstrom06b33aa2001-02-15 03:01:59 +0000883 case 'm':
dtucker@openbsd.org4f7cc2f2015-09-04 08:21:47 +0000884 if (mac_valid(optarg)) {
885 free(options.macs);
Ben Lindstrom06b33aa2001-02-15 03:01:59 +0000886 options.macs = xstrdup(optarg);
dtucker@openbsd.org4f7cc2f2015-09-04 08:21:47 +0000887 } else {
Damien Millerf4614452001-07-14 12:18:10 +1000888 fprintf(stderr, "Unknown mac type '%s'\n",
889 optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100890 exit(255);
Ben Lindstrom06b33aa2001-02-15 03:01:59 +0000891 }
892 break;
Damien Miller0e220db2004-06-15 10:34:08 +1000893 case 'M':
Damien Millerd14b1e72005-06-16 13:19:41 +1000894 if (options.control_master == SSHCTL_MASTER_YES)
895 options.control_master = SSHCTL_MASTER_ASK;
896 else
897 options.control_master = SSHCTL_MASTER_YES;
Damien Miller0e220db2004-06-15 10:34:08 +1000898 break;
Damien Miller95def091999-11-25 00:26:21 +1100899 case 'p':
millert@openbsd.org887669e2017-10-21 23:06:24 +0000900 if (options.port == -1) {
901 options.port = a2port(optarg);
902 if (options.port <= 0) {
903 fprintf(stderr, "Bad port '%s'\n",
904 optarg);
905 exit(255);
906 }
Ben Lindstrom146edb92001-04-11 23:06:28 +0000907 }
Damien Miller95def091999-11-25 00:26:21 +1100908 break;
Damien Miller95def091999-11-25 00:26:21 +1100909 case 'l':
millert@openbsd.org887669e2017-10-21 23:06:24 +0000910 if (options.user == NULL)
911 options.user = optarg;
Damien Miller95def091999-11-25 00:26:21 +1100912 break;
Ben Lindstrom1a174712001-09-12 17:56:15 +0000913
Damien Miller95def091999-11-25 00:26:21 +1100914 case 'L':
Damien Miller4bf648f2009-02-14 16:28:21 +1100915 if (parse_forward(&fwd, optarg, 0, 0))
Damien Millerf91ee4c2005-03-01 21:24:33 +1100916 add_local_forward(&options, &fwd);
917 else {
Damien Millerf4614452001-07-14 12:18:10 +1000918 fprintf(stderr,
Damien Millerf91ee4c2005-03-01 21:24:33 +1100919 "Bad local forwarding specification '%s'\n",
Damien Millerf4614452001-07-14 12:18:10 +1000920 optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100921 exit(255);
Ben Lindstrom1a174712001-09-12 17:56:15 +0000922 }
Damien Millerf91ee4c2005-03-01 21:24:33 +1100923 break;
924
925 case 'R':
markus@openbsd.org609d7a62017-09-21 19:16:53 +0000926 if (parse_forward(&fwd, optarg, 0, 1) ||
927 parse_forward(&fwd, optarg, 1, 1)) {
Damien Millerf91ee4c2005-03-01 21:24:33 +1100928 add_remote_forward(&options, &fwd);
929 } else {
930 fprintf(stderr,
931 "Bad remote forwarding specification "
932 "'%s'\n", optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100933 exit(255);
Damien Millerf91ee4c2005-03-01 21:24:33 +1100934 }
Damien Miller95def091999-11-25 00:26:21 +1100935 break;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000936
937 case 'D':
Damien Miller4bf648f2009-02-14 16:28:21 +1100938 if (parse_forward(&fwd, optarg, 1, 0)) {
Damien Millera699d952008-11-03 19:27:34 +1100939 add_local_forward(&options, &fwd);
Damien Millerf91ee4c2005-03-01 21:24:33 +1100940 } else {
Damien Millera699d952008-11-03 19:27:34 +1100941 fprintf(stderr,
942 "Bad dynamic forwarding specification "
943 "'%s'\n", optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100944 exit(255);
Ben Lindstrom146edb92001-04-11 23:06:28 +0000945 }
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000946 break;
947
Damien Miller95def091999-11-25 00:26:21 +1100948 case 'C':
949 options.compression = 1;
950 break;
Damien Miller1383bd82000-04-06 12:32:37 +1000951 case 'N':
952 no_shell_flag = 1;
Damien Miller21771e22011-05-15 08:45:50 +1000953 options.request_tty = REQUEST_TTY_NO;
Damien Miller1383bd82000-04-06 12:32:37 +1000954 break;
Damien Miller1383bd82000-04-06 12:32:37 +1000955 case 'T':
Damien Miller21771e22011-05-15 08:45:50 +1000956 options.request_tty = REQUEST_TTY_NO;
Damien Miller1383bd82000-04-06 12:32:37 +1000957 break;
Damien Miller95def091999-11-25 00:26:21 +1100958 case 'o':
Damien Miller9836cf82003-12-17 16:30:06 +1100959 line = xstrdup(optarg);
djm@openbsd.org957fbce2014-10-08 22:20:25 +0000960 if (process_config_line(&options, pw,
961 host ? host : "", host ? host : "", line,
962 "command-line", 0, NULL, SSHCONF_USERCONF) != 0)
Darren Tuckere9a9b712005-12-20 16:15:51 +1100963 exit(255);
Darren Tuckera627d422013-06-02 07:31:17 +1000964 free(line);
Damien Miller95def091999-11-25 00:26:21 +1100965 break;
Damien Miller832562e2001-01-30 09:30:01 +1100966 case 's':
967 subsystem_flag = 1;
968 break;
Damien Miller0e220db2004-06-15 10:34:08 +1000969 case 'S':
mmcc@openbsd.orgd59ce082015-12-10 17:08:40 +0000970 free(options.control_path);
Damien Miller0e220db2004-06-15 10:34:08 +1000971 options.control_path = xstrdup(optarg);
Damien Miller0e220db2004-06-15 10:34:08 +1000972 break;
Ben Lindstrome0f88042001-04-30 13:06:24 +0000973 case 'b':
974 options.bind_address = optarg;
975 break;
djm@openbsd.orgac2e3022018-02-23 02:34:33 +0000976 case 'B':
977 options.bind_interface = optarg;
978 break;
Ben Lindstrom14f31ab2001-09-12 17:48:04 +0000979 case 'F':
980 config = optarg;
981 break;
Damien Miller95def091999-11-25 00:26:21 +1100982 default:
983 usage();
984 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000985 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000986
djm@openbsd.org643c2ad2017-08-12 06:46:01 +0000987 if (optind > 1 && strcmp(av[optind - 1], "--") == 0)
988 opt_terminated = 1;
989
Damien Millerf4614452001-07-14 12:18:10 +1000990 ac -= optind;
991 av += optind;
992
Darren Tuckerb8c884a2010-01-08 18:53:43 +1100993 if (ac > 0 && !host) {
millert@openbsd.org887669e2017-10-21 23:06:24 +0000994 int tport;
995 char *tuser;
996 switch (parse_ssh_uri(*av, &tuser, &host, &tport)) {
997 case -1:
998 usage();
999 break;
1000 case 0:
1001 if (options.user == NULL) {
1002 options.user = tuser;
1003 tuser = NULL;
1004 }
1005 free(tuser);
1006 if (options.port == -1 && tport != -1)
1007 options.port = tport;
1008 break;
1009 default:
Damien Millerf4614452001-07-14 12:18:10 +10001010 p = xstrdup(*av);
Ben Lindstromc276c122002-12-23 02:14:51 +00001011 cp = strrchr(p, '@');
millert@openbsd.org887669e2017-10-21 23:06:24 +00001012 if (cp != NULL) {
1013 if (cp == p)
1014 usage();
1015 if (options.user == NULL) {
1016 options.user = p;
1017 p = NULL;
1018 }
1019 *cp++ = '\0';
1020 host = xstrdup(cp);
1021 free(p);
1022 } else
1023 host = p;
1024 break;
1025 }
djm@openbsd.org643c2ad2017-08-12 06:46:01 +00001026 if (ac > 1 && !opt_terminated) {
Ben Lindstromb9fa6912002-12-23 02:24:54 +00001027 optind = optreset = 1;
Damien Millerf4614452001-07-14 12:18:10 +10001028 goto again;
1029 }
Ben Lindstromb9fa6912002-12-23 02:24:54 +00001030 ac--, av++;
Damien Millerf4614452001-07-14 12:18:10 +10001031 }
1032
Damien Miller95def091999-11-25 00:26:21 +11001033 /* Check that we got a host name. */
1034 if (!host)
1035 usage();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001036
Damien Miller0faf7472013-10-17 11:47:23 +11001037 host_arg = xstrdup(host);
1038
Damien Miller1f0311c2014-05-15 14:24:09 +10001039#ifdef WITH_OPENSSL
Damien Miller4314c2b2010-09-10 11:12:09 +10001040 OpenSSL_add_all_algorithms();
Damien Miller0bc1bd82000-11-13 22:57:25 +11001041 ERR_load_crypto_strings();
Damien Miller1f0311c2014-05-15 14:24:09 +10001042#endif
Damien Millercb5e44a2000-09-29 12:12:36 +11001043
Damien Miller95def091999-11-25 00:26:21 +11001044 /* Initialize the command to execute on remote host. */
1045 buffer_init(&command);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001046
Damien Miller5428f641999-11-25 11:54:57 +11001047 /*
1048 * Save the command to execute on the remote host in a buffer. There
1049 * is no limit on the length of the command, except by the maximum
1050 * packet size. Also sets the tty flag if there is no command.
1051 */
Damien Millerf4614452001-07-14 12:18:10 +10001052 if (!ac) {
Damien Miller95def091999-11-25 00:26:21 +11001053 /* No command specified - execute shell on a tty. */
Damien Miller832562e2001-01-30 09:30:01 +11001054 if (subsystem_flag) {
Damien Millerf4614452001-07-14 12:18:10 +10001055 fprintf(stderr,
1056 "You must specify a subsystem to invoke.\n");
Damien Miller832562e2001-01-30 09:30:01 +11001057 usage();
1058 }
Damien Miller95def091999-11-25 00:26:21 +11001059 } else {
Damien Millerf4614452001-07-14 12:18:10 +10001060 /* A command has been specified. Store it into the buffer. */
1061 for (i = 0; i < ac; i++) {
1062 if (i)
Damien Miller95def091999-11-25 00:26:21 +11001063 buffer_append(&command, " ", 1);
1064 buffer_append(&command, av[i], strlen(av[i]));
1065 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001066 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001067
Ben Lindstrom8a432f52001-03-05 07:24:46 +00001068 /*
1069 * Initialize "log" output. Since we are the client all output
Damien Miller03d4d7e2013-04-23 15:21:06 +10001070 * goes to stderr unless otherwise specified by -y or -E.
Ben Lindstrom8a432f52001-03-05 07:24:46 +00001071 */
Damien Miller03d4d7e2013-04-23 15:21:06 +10001072 if (use_syslog && logfile != NULL)
1073 fatal("Can't specify both -y and -E");
dtucker@openbsd.org4f7cc2f2015-09-04 08:21:47 +00001074 if (logfile != NULL)
Damien Miller03d4d7e2013-04-23 15:21:06 +10001075 log_redirect_stderr_to(logfile);
Darren Tucker72efd742009-06-21 17:48:00 +10001076 log_init(argv0,
djm@openbsd.org@openbsd.orgdbe06622017-10-27 01:57:06 +00001077 options.log_level == SYSLOG_LEVEL_NOT_SET ?
dtucker@openbsd.org68d3a2a2017-04-28 03:20:27 +00001078 SYSLOG_LEVEL_INFO : options.log_level,
djm@openbsd.org@openbsd.orgdbe06622017-10-27 01:57:06 +00001079 options.log_facility == SYSLOG_FACILITY_NOT_SET ?
dtucker@openbsd.org68d3a2a2017-04-28 03:20:27 +00001080 SYSLOG_FACILITY_USER : options.log_facility,
1081 !use_syslog);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001082
Damien Miller03d4d7e2013-04-23 15:21:06 +10001083 if (debug_flag)
Damien Miller1f0311c2014-05-15 14:24:09 +10001084 logit("%s, %s", SSH_RELEASE,
1085#ifdef WITH_OPENSSL
1086 SSLeay_version(SSLEAY_VERSION)
1087#else
1088 "without OpenSSL"
1089#endif
1090 );
Damien Miller03d4d7e2013-04-23 15:21:06 +10001091
Damien Miller13f97b22014-02-24 15:57:55 +11001092 /* Parse the configuration files */
djm@openbsd.org957fbce2014-10-08 22:20:25 +00001093 process_config_files(host_arg, pw, 0);
Ben Lindstrom83f07d12001-10-03 17:22:29 +00001094
Damien Miller13f97b22014-02-24 15:57:55 +11001095 /* Hostname canonicalisation needs a few options filled. */
1096 fill_default_options_for_canonicalization(&options);
1097
1098 /* If the user has replaced the hostname then take it into use now */
1099 if (options.hostname != NULL) {
1100 /* NB. Please keep in sync with readconf.c:match_cfg_line() */
1101 cp = percent_expand(options.hostname,
1102 "h", host, (char *)NULL);
1103 free(host);
1104 host = cp;
djm@openbsd.org957fbce2014-10-08 22:20:25 +00001105 free(options.hostname);
1106 options.hostname = xstrdup(host);
Damien Miller13f97b22014-02-24 15:57:55 +11001107 }
1108
djm@openbsd.orgfc21ea92018-01-23 05:06:25 +00001109 /* Don't lowercase addresses, they will be explicitly canonicalised */
1110 if ((was_addr = is_addr(host)) == 0)
1111 lowercase(host);
1112
1113 /*
1114 * Try to canonicalize if requested by configuration or the
1115 * hostname is an address.
1116 */
1117 if (options.canonicalize_hostname != SSH_CANONICALISE_NO || was_addr)
Damien Miller13f97b22014-02-24 15:57:55 +11001118 addrs = resolve_canonicalize(&host, options.port);
1119
1120 /*
Damien Miller08b57c62014-02-27 10:17:13 +11001121 * If CanonicalizePermittedCNAMEs have been specified but
1122 * other canonicalization did not happen (by not being requested
1123 * or by failing with fallback) then the hostname may still be changed
djm@openbsd.org@openbsd.orgdbe06622017-10-27 01:57:06 +00001124 * as a result of CNAME following.
Damien Miller08b57c62014-02-27 10:17:13 +11001125 *
1126 * Try to resolve the bare hostname name using the system resolver's
1127 * usual search rules and then apply the CNAME follow rules.
1128 *
1129 * Skip the lookup if a ProxyCommand is being used unless the user
1130 * has specifically requested canonicalisation for this case via
1131 * CanonicalizeHostname=always
Damien Miller13f97b22014-02-24 15:57:55 +11001132 */
djm@openbsd.orged877ef2016-07-15 00:24:30 +00001133 direct = option_clear_or_none(options.proxy_command) &&
1134 options.jump_host == NULL;
1135 if (addrs == NULL && options.num_permitted_cnames != 0 && (direct ||
1136 options.canonicalize_hostname == SSH_CANONICALISE_ALWAYS)) {
Damien Miller19439e92014-07-02 15:28:40 +10001137 if ((addrs = resolve_host(host, options.port,
1138 option_clear_or_none(options.proxy_command),
1139 cname, sizeof(cname))) == NULL) {
1140 /* Don't fatal proxied host names not in the DNS */
1141 if (option_clear_or_none(options.proxy_command))
1142 cleanup_exit(255); /* logged in resolve_host */
1143 } else
djm@openbsd.orged877ef2016-07-15 00:24:30 +00001144 check_follow_cname(direct, &host, cname);
Damien Miller13f97b22014-02-24 15:57:55 +11001145 }
1146
1147 /*
djm@openbsd.org957fbce2014-10-08 22:20:25 +00001148 * If canonicalisation is enabled then re-parse the configuration
1149 * files as new stanzas may match.
Damien Miller13f97b22014-02-24 15:57:55 +11001150 */
djm@openbsd.org957fbce2014-10-08 22:20:25 +00001151 if (options.canonicalize_hostname != 0) {
1152 debug("Re-reading configuration after hostname "
1153 "canonicalisation");
1154 free(options.hostname);
1155 options.hostname = xstrdup(host);
1156 process_config_files(host_arg, pw, 1);
1157 /*
1158 * Address resolution happens early with canonicalisation
1159 * enabled and the port number may have changed since, so
1160 * reset it in address list
1161 */
1162 if (addrs != NULL && options.port > 0)
1163 set_addrinfo_port(addrs, options.port);
Ben Lindstrom14f31ab2001-09-12 17:48:04 +00001164 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001165
Damien Miller95def091999-11-25 00:26:21 +11001166 /* Fill configuration defaults. */
1167 fill_default_options(&options);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001168
djm@openbsd.orged877ef2016-07-15 00:24:30 +00001169 /*
1170 * If ProxyJump option specified, then construct a ProxyCommand now.
1171 */
1172 if (options.jump_host != NULL) {
1173 char port_s[8];
1174
1175 /* Consistency check */
1176 if (options.proxy_command != NULL)
1177 fatal("inconsistent options: ProxyCommand+ProxyJump");
1178 /* Never use FD passing for ProxyJump */
1179 options.proxy_use_fdpass = 0;
1180 snprintf(port_s, sizeof(port_s), "%d", options.jump_port);
1181 xasprintf(&options.proxy_command,
djm@openbsd.org8fb15312017-03-08 12:07:47 +00001182 "ssh%s%s%s%s%s%s%s%s%s%.*s -W '[%%h]:%%p' %s",
djm@openbsd.orged877ef2016-07-15 00:24:30 +00001183 /* Optional "-l user" argument if jump_user set */
1184 options.jump_user == NULL ? "" : " -l ",
1185 options.jump_user == NULL ? "" : options.jump_user,
1186 /* Optional "-p port" argument if jump_port set */
1187 options.jump_port <= 0 ? "" : " -p ",
1188 options.jump_port <= 0 ? "" : port_s,
1189 /* Optional additional jump hosts ",..." */
1190 options.jump_extra == NULL ? "" : " -J ",
1191 options.jump_extra == NULL ? "" : options.jump_extra,
1192 /* Optional "-F" argumment if -F specified */
1193 config == NULL ? "" : " -F ",
1194 config == NULL ? "" : config,
1195 /* Optional "-v" arguments if -v set */
1196 debug_flag ? " -" : "",
1197 debug_flag, "vvv",
1198 /* Mandatory hostname */
1199 options.jump_host);
1200 debug("Setting implicit ProxyCommand from ProxyJump: %s",
1201 options.proxy_command);
1202 }
1203
Damien Miller13f97b22014-02-24 15:57:55 +11001204 if (options.port == 0)
1205 options.port = default_ssh_port();
djm@openbsd.orgdbee4112017-09-12 06:32:07 +00001206 channel_set_af(ssh, options.address_family);
Darren Tucker0a4f04b2003-07-03 20:37:47 +10001207
Damien Millere9fc72e2013-10-15 12:14:12 +11001208 /* Tidy and check options */
1209 if (options.host_key_alias != NULL)
1210 lowercase(options.host_key_alias);
1211 if (options.proxy_command != NULL &&
1212 strcmp(options.proxy_command, "-") == 0 &&
1213 options.proxy_use_fdpass)
1214 fatal("ProxyCommand=- and ProxyUseFDPass are incompatible");
djm@openbsd.org44732de2015-02-20 22:17:21 +00001215 if (options.control_persist &&
1216 options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK) {
1217 debug("UpdateHostKeys=ask is incompatible with ControlPersist; "
1218 "disabling");
1219 options.update_hostkeys = 0;
1220 }
djm@openbsd.org88b6fcd2015-11-19 08:23:27 +00001221 if (options.connection_attempts <= 0)
1222 fatal("Invalid number of ConnectionAttempts");
Damien Miller0faf7472013-10-17 11:47:23 +11001223#ifndef HAVE_CYGWIN
1224 if (original_effective_uid != 0)
1225 options.use_privileged_port = 0;
1226#endif
Damien Millere9fc72e2013-10-15 12:14:12 +11001227
bluhm@openbsd.org1112b532017-05-30 18:58:37 +00001228 if (buffer_len(&command) != 0 && options.remote_command != NULL)
1229 fatal("Cannot execute command-line and remote command.");
1230
1231 /* Cannot fork to background if no command. */
1232 if (fork_after_authentication_flag && buffer_len(&command) == 0 &&
1233 options.remote_command == NULL && !no_shell_flag)
1234 fatal("Cannot fork into background without a command "
1235 "to execute.");
1236
Damien Miller95def091999-11-25 00:26:21 +11001237 /* reinit */
dtucker@openbsd.org68d3a2a2017-04-28 03:20:27 +00001238 log_init(argv0, options.log_level, options.log_facility, !use_syslog);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001239
Damien Millerfff9f092012-07-06 13:45:01 +10001240 if (options.request_tty == REQUEST_TTY_YES ||
1241 options.request_tty == REQUEST_TTY_FORCE)
1242 tty_flag = 1;
1243
1244 /* Allocate a tty by default if no command specified. */
bluhm@openbsd.org1112b532017-05-30 18:58:37 +00001245 if (buffer_len(&command) == 0 && options.remote_command == NULL)
Damien Millerfff9f092012-07-06 13:45:01 +10001246 tty_flag = options.request_tty != REQUEST_TTY_NO;
1247
1248 /* Force no tty */
markus@openbsd.org8d057842016-09-30 09:19:13 +00001249 if (options.request_tty == REQUEST_TTY_NO ||
1250 (muxclient_command && muxclient_command != SSHMUX_COMMAND_PROXY))
Damien Millerfff9f092012-07-06 13:45:01 +10001251 tty_flag = 0;
1252 /* Do not allocate a tty if stdin is not a tty. */
1253 if ((!isatty(fileno(stdin)) || stdin_null_flag) &&
1254 options.request_tty != REQUEST_TTY_FORCE) {
1255 if (tty_flag)
1256 logit("Pseudo-terminal will not be allocated because "
1257 "stdin is not a terminal.");
1258 tty_flag = 0;
1259 }
1260
Damien Miller60bc5172001-03-19 09:38:15 +11001261 seed_rng();
1262
Damien Miller95def091999-11-25 00:26:21 +11001263 if (options.user == NULL)
1264 options.user = xstrdup(pw->pw_name);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001265
djm@openbsd.orgb7548b12017-10-23 05:08:00 +00001266 /* Set up strings used to percent_expand() arguments */
Damien Millerdfc85fa2011-05-15 08:44:02 +10001267 if (gethostname(thishost, sizeof(thishost)) == -1)
1268 fatal("gethostname: %s", strerror(errno));
1269 strlcpy(shorthost, thishost, sizeof(shorthost));
1270 shorthost[strcspn(thishost, ".")] = '\0';
1271 snprintf(portstr, sizeof(portstr), "%d", options.port);
djm@openbsd.org674b3b62015-09-11 03:47:28 +00001272 snprintf(uidstr, sizeof(uidstr), "%d", pw->pw_uid);
Darren Tuckerf6b01b72008-06-13 04:56:37 +10001273
Damien Miller9c386432014-07-03 21:27:46 +10001274 if ((md = ssh_digest_start(SSH_DIGEST_SHA1)) == NULL ||
1275 ssh_digest_update(md, thishost, strlen(thishost)) < 0 ||
1276 ssh_digest_update(md, host, strlen(host)) < 0 ||
1277 ssh_digest_update(md, portstr, strlen(portstr)) < 0 ||
1278 ssh_digest_update(md, options.user, strlen(options.user)) < 0 ||
1279 ssh_digest_final(md, conn_hash, sizeof(conn_hash)) < 0)
1280 fatal("%s: mux digest failed", __func__);
1281 ssh_digest_free(md);
1282 conn_hash_hex = tohex(conn_hash, ssh_digest_bytes(SSH_DIGEST_SHA1));
1283
djm@openbsd.orgb7548b12017-10-23 05:08:00 +00001284 /*
1285 * Expand tokens in arguments. NB. LocalCommand is expanded later,
1286 * after port-forwarding is set up, so it may pick up any local
1287 * tunnel interface name allocated.
1288 */
bluhm@openbsd.org1112b532017-05-30 18:58:37 +00001289 if (options.remote_command != NULL) {
1290 debug3("expanding RemoteCommand: %s", options.remote_command);
1291 cp = options.remote_command;
1292 options.remote_command = percent_expand(cp,
1293 "C", conn_hash_hex,
1294 "L", shorthost,
1295 "d", pw->pw_dir,
1296 "h", host,
1297 "l", thishost,
1298 "n", host_arg,
1299 "p", portstr,
1300 "r", options.user,
1301 "u", pw->pw_name,
1302 (char *)NULL);
1303 debug3("expanded RemoteCommand: %s", options.remote_command);
1304 free(cp);
1305 buffer_append(&command, options.remote_command,
1306 strlen(options.remote_command));
bluhm@openbsd.org1112b532017-05-30 18:58:37 +00001307 }
1308
Damien Miller0e220db2004-06-15 10:34:08 +10001309 if (options.control_path != NULL) {
Damien Miller6476cad2005-06-16 13:18:34 +10001310 cp = tilde_expand_filename(options.control_path,
1311 original_real_uid);
Darren Tuckera627d422013-06-02 07:31:17 +10001312 free(options.control_path);
Damien Miller9c386432014-07-03 21:27:46 +10001313 options.control_path = percent_expand(cp,
1314 "C", conn_hash_hex,
1315 "L", shorthost,
1316 "h", host,
1317 "l", thishost,
1318 "n", host_arg,
1319 "p", portstr,
1320 "r", options.user,
1321 "u", pw->pw_name,
djm@openbsd.org674b3b62015-09-11 03:47:28 +00001322 "i", uidstr,
Damien Millerdfc85fa2011-05-15 08:44:02 +10001323 (char *)NULL);
Darren Tuckera627d422013-06-02 07:31:17 +10001324 free(cp);
Damien Miller0e220db2004-06-15 10:34:08 +10001325 }
Damien Miller9c386432014-07-03 21:27:46 +10001326 free(conn_hash_hex);
1327
djm@openbsd.org957fbce2014-10-08 22:20:25 +00001328 if (config_test) {
1329 dump_client_config(&options, host);
1330 exit(0);
1331 }
1332
Damien Millerb1cbfa22008-05-19 16:00:08 +10001333 if (muxclient_command != 0 && options.control_path == NULL)
Darren Tucker0814d312005-06-01 23:08:51 +10001334 fatal("No ControlPath specified for \"-O\" command");
markus@openbsd.org8d057842016-09-30 09:19:13 +00001335 if (options.control_path != NULL) {
1336 int sock;
1337 if ((sock = muxclient(options.control_path)) >= 0) {
djm@openbsd.orgdbee4112017-09-12 06:32:07 +00001338 ssh_packet_set_connection(ssh, sock, sock);
markus@openbsd.org8d057842016-09-30 09:19:13 +00001339 packet_set_mux();
1340 goto skip_connect;
1341 }
1342 }
Damien Miller0e220db2004-06-15 10:34:08 +10001343
Damien Miller08b57c62014-02-27 10:17:13 +11001344 /*
1345 * If hostname canonicalisation was not enabled, then we may not
1346 * have yet resolved the hostname. Do so now.
1347 */
1348 if (addrs == NULL && options.proxy_command == NULL) {
djm@openbsd.orga85768a2015-09-04 04:56:09 +00001349 debug2("resolving \"%s\" port %d", host, options.port);
Damien Miller08b57c62014-02-27 10:17:13 +11001350 if ((addrs = resolve_host(host, options.port, 1,
1351 cname, sizeof(cname))) == NULL)
1352 cleanup_exit(255); /* resolve_host logs the error */
1353 }
1354
Damien Miller67bd0622007-09-17 12:06:57 +10001355 timeout_ms = options.connection_timeout * 1000;
1356
Kevin Stevesfcec7f82000-12-15 19:55:48 +00001357 /* Open a connection to the remote host. */
djm@openbsd.orgdbee4112017-09-12 06:32:07 +00001358 if (ssh_connect(ssh, host, addrs, &hostaddr, options.port,
Damien Miller0faf7472013-10-17 11:47:23 +11001359 options.address_family, options.connection_attempts,
1360 &timeout_ms, options.tcp_keep_alive,
1361 options.use_privileged_port) != 0)
1362 exit(255);
1363
Damien Miller28631ce2013-10-26 10:07:56 +11001364 if (addrs != NULL)
1365 freeaddrinfo(addrs);
1366
Damien Miller0faf7472013-10-17 11:47:23 +11001367 packet_set_timeout(options.server_alive_interval,
1368 options.server_alive_count_max);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001369
djm@openbsd.org95767262016-03-07 19:02:43 +00001370 ssh = active_state; /* XXX */
1371
Damien Miller67bd0622007-09-17 12:06:57 +10001372 if (timeout_ms > 0)
1373 debug3("timeout: %d ms remain after connect", timeout_ms);
1374
Damien Miller5428f641999-11-25 11:54:57 +11001375 /*
1376 * If we successfully made the connection, load the host private key
1377 * in case we will need it later for combined rsa-rhosts
1378 * authentication. This must be done before releasing extra
1379 * privileges, because the file is only readable by root.
Ben Lindstrom9e5bb572002-06-06 19:58:27 +00001380 * If we cannot access the private keys, load the public keys
1381 * instead and try to execute the ssh-keysign helper instead.
Damien Miller5428f641999-11-25 11:54:57 +11001382 */
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001383 sensitive_data.nkeys = 0;
1384 sensitive_data.keys = NULL;
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001385 sensitive_data.external_keysign = 0;
djm@openbsd.org873d3e72017-04-30 23:18:44 +00001386 if (options.hostbased_authentication) {
markus@openbsd.org1b11ea72018-02-23 15:58:37 +00001387 sensitive_data.nkeys = 11;
Damien Millerddd63ab2006-03-31 23:10:51 +11001388 sensitive_data.keys = xcalloc(sensitive_data.nkeys,
markus@openbsd.org54d90ac2017-05-30 08:52:19 +00001389 sizeof(struct sshkey)); /* XXX */
Damien Miller6af914a2010-09-10 11:39:26 +10001390 for (i = 0; i < sensitive_data.nkeys; i++)
1391 sensitive_data.keys[i] = NULL;
Ben Lindstromf9c48842002-06-11 16:37:51 +00001392
1393 PRIV_START;
Damien Miller6af914a2010-09-10 11:39:26 +10001394#ifdef OPENSSL_HAS_ECC
djm@openbsd.orgab24ab82015-01-08 10:15:45 +00001395 sensitive_data.keys[1] = key_load_private_cert(KEY_ECDSA,
Damien Millereb8b60e2010-08-31 22:41:14 +10001396 _PATH_HOST_ECDSA_KEY_FILE, "", NULL);
Damien Miller6af914a2010-09-10 11:39:26 +10001397#endif
djm@openbsd.orgab24ab82015-01-08 10:15:45 +00001398 sensitive_data.keys[2] = key_load_private_cert(KEY_ED25519,
1399 _PATH_HOST_ED25519_KEY_FILE, "", NULL);
Damien Millereb8b60e2010-08-31 22:41:14 +10001400 sensitive_data.keys[3] = key_load_private_cert(KEY_RSA,
Damien Millerc1583312010-08-05 13:04:50 +10001401 _PATH_HOST_RSA_KEY_FILE, "", NULL);
djm@openbsd.orgab24ab82015-01-08 10:15:45 +00001402 sensitive_data.keys[4] = key_load_private_cert(KEY_DSA,
1403 _PATH_HOST_DSA_KEY_FILE, "", NULL);
Damien Miller6af914a2010-09-10 11:39:26 +10001404#ifdef OPENSSL_HAS_ECC
djm@openbsd.orgab24ab82015-01-08 10:15:45 +00001405 sensitive_data.keys[5] = key_load_private_type(KEY_ECDSA,
Damien Millereb8b60e2010-08-31 22:41:14 +10001406 _PATH_HOST_ECDSA_KEY_FILE, "", NULL, NULL);
Damien Miller6af914a2010-09-10 11:39:26 +10001407#endif
djm@openbsd.orgab24ab82015-01-08 10:15:45 +00001408 sensitive_data.keys[6] = key_load_private_type(KEY_ED25519,
1409 _PATH_HOST_ED25519_KEY_FILE, "", NULL, NULL);
Damien Miller0fa47cf2013-12-29 17:53:39 +11001410 sensitive_data.keys[7] = key_load_private_type(KEY_RSA,
Darren Tucker232b76f2006-05-06 17:41:51 +10001411 _PATH_HOST_RSA_KEY_FILE, "", NULL, NULL);
djm@openbsd.orgab24ab82015-01-08 10:15:45 +00001412 sensitive_data.keys[8] = key_load_private_type(KEY_DSA,
1413 _PATH_HOST_DSA_KEY_FILE, "", NULL, NULL);
markus@openbsd.org1b11ea72018-02-23 15:58:37 +00001414 sensitive_data.keys[9] = key_load_private_cert(KEY_XMSS,
1415 _PATH_HOST_XMSS_KEY_FILE, "", NULL);
1416 sensitive_data.keys[10] = key_load_private_type(KEY_XMSS,
1417 _PATH_HOST_XMSS_KEY_FILE, "", NULL, NULL);
Ben Lindstromf9c48842002-06-11 16:37:51 +00001418 PRIV_END;
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001419
Ben Lindstrom5d35a2f2002-07-04 00:19:40 +00001420 if (options.hostbased_authentication == 1 &&
1421 sensitive_data.keys[0] == NULL &&
Damien Millereb8b60e2010-08-31 22:41:14 +10001422 sensitive_data.keys[5] == NULL &&
Damien Miller5be9d9e2013-12-07 11:24:01 +11001423 sensitive_data.keys[6] == NULL &&
Damien Miller0fa47cf2013-12-29 17:53:39 +11001424 sensitive_data.keys[7] == NULL &&
markus@openbsd.org1b11ea72018-02-23 15:58:37 +00001425 sensitive_data.keys[8] == NULL &&
1426 sensitive_data.keys[9] == NULL) {
Damien Miller6af914a2010-09-10 11:39:26 +10001427#ifdef OPENSSL_HAS_ECC
djm@openbsd.orgab24ab82015-01-08 10:15:45 +00001428 sensitive_data.keys[1] = key_load_cert(
Damien Millereb8b60e2010-08-31 22:41:14 +10001429 _PATH_HOST_ECDSA_KEY_FILE);
Damien Miller6af914a2010-09-10 11:39:26 +10001430#endif
djm@openbsd.orgab24ab82015-01-08 10:15:45 +00001431 sensitive_data.keys[2] = key_load_cert(
1432 _PATH_HOST_ED25519_KEY_FILE);
Damien Millereb8b60e2010-08-31 22:41:14 +10001433 sensitive_data.keys[3] = key_load_cert(
Damien Millerc1583312010-08-05 13:04:50 +10001434 _PATH_HOST_RSA_KEY_FILE);
Damien Miller0fa47cf2013-12-29 17:53:39 +11001435 sensitive_data.keys[4] = key_load_cert(
djm@openbsd.orgab24ab82015-01-08 10:15:45 +00001436 _PATH_HOST_DSA_KEY_FILE);
Damien Miller6af914a2010-09-10 11:39:26 +10001437#ifdef OPENSSL_HAS_ECC
djm@openbsd.orgab24ab82015-01-08 10:15:45 +00001438 sensitive_data.keys[5] = key_load_public(
Damien Millereb8b60e2010-08-31 22:41:14 +10001439 _PATH_HOST_ECDSA_KEY_FILE, NULL);
Damien Miller6af914a2010-09-10 11:39:26 +10001440#endif
djm@openbsd.orgab24ab82015-01-08 10:15:45 +00001441 sensitive_data.keys[6] = key_load_public(
1442 _PATH_HOST_ED25519_KEY_FILE, NULL);
Damien Miller5be9d9e2013-12-07 11:24:01 +11001443 sensitive_data.keys[7] = key_load_public(
Damien Miller0fa47cf2013-12-29 17:53:39 +11001444 _PATH_HOST_RSA_KEY_FILE, NULL);
1445 sensitive_data.keys[8] = key_load_public(
djm@openbsd.orgab24ab82015-01-08 10:15:45 +00001446 _PATH_HOST_DSA_KEY_FILE, NULL);
markus@openbsd.org1b11ea72018-02-23 15:58:37 +00001447 sensitive_data.keys[9] = key_load_cert(
1448 _PATH_HOST_XMSS_KEY_FILE);
1449 sensitive_data.keys[10] = key_load_public(
1450 _PATH_HOST_XMSS_KEY_FILE, NULL);
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001451 sensitive_data.external_keysign = 1;
1452 }
Damien Miller95def091999-11-25 00:26:21 +11001453 }
Damien Miller5428f641999-11-25 11:54:57 +11001454 /*
1455 * Get rid of any extra privileges that we may have. We will no
1456 * longer need them. Also, extra privileges could make it very hard
1457 * to read identity files and other non-world-readable files from the
1458 * user's home directory if it happens to be on a NFS volume where
1459 * root is mapped to nobody.
1460 */
Darren Tucker25f60a72004-08-15 17:23:34 +10001461 if (original_effective_uid == 0) {
1462 PRIV_START;
1463 permanently_set_uid(pw);
1464 }
Damien Miller95def091999-11-25 00:26:21 +11001465
Damien Miller5428f641999-11-25 11:54:57 +11001466 /*
1467 * Now that we are back to our own permissions, create ~/.ssh
Damien Miller788f2122005-11-05 15:14:59 +11001468 * directory if it doesn't already exist.
Damien Miller5428f641999-11-25 11:54:57 +11001469 */
Darren Tucker45c66d72011-11-04 10:50:40 +11001470 if (config == NULL) {
1471 r = snprintf(buf, sizeof buf, "%s%s%s", pw->pw_dir,
1472 strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR);
1473 if (r > 0 && (size_t)r < sizeof(buf) && stat(buf, &st) < 0) {
Darren Tucker8ccb7392010-09-10 12:28:24 +10001474#ifdef WITH_SELINUX
Darren Tucker45c66d72011-11-04 10:50:40 +11001475 ssh_selinux_setfscreatecon(buf);
Darren Tucker8ccb7392010-09-10 12:28:24 +10001476#endif
Darren Tucker45c66d72011-11-04 10:50:40 +11001477 if (mkdir(buf, 0700) < 0)
1478 error("Could not create directory '%.200s'.",
1479 buf);
Darren Tucker8ccb7392010-09-10 12:28:24 +10001480#ifdef WITH_SELINUX
Darren Tucker45c66d72011-11-04 10:50:40 +11001481 ssh_selinux_setfscreatecon(NULL);
Darren Tucker8ccb7392010-09-10 12:28:24 +10001482#endif
Darren Tucker45c66d72011-11-04 10:50:40 +11001483 }
Darren Tucker8ccb7392010-09-10 12:28:24 +10001484 }
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001485 /* load options.identity_files */
djm@openbsd.orgb7548b12017-10-23 05:08:00 +00001486 load_public_identity_files(pw);
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001487
djm@openbsd.org001aa552018-04-10 00:10:49 +00001488 /* optionally set the SSH_AUTHSOCKET_ENV_NAME variable */
markus@openbsd.org1a75d142016-05-04 14:29:58 +00001489 if (options.identity_agent &&
1490 strcmp(options.identity_agent, SSH_AUTHSOCKET_ENV_NAME) != 0) {
markus@openbsd.orgb02ad1c2016-05-04 12:21:53 +00001491 if (strcmp(options.identity_agent, "none") == 0) {
1492 unsetenv(SSH_AUTHSOCKET_ENV_NAME);
1493 } else {
1494 p = tilde_expand_filename(options.identity_agent,
1495 original_real_uid);
1496 cp = percent_expand(p, "d", pw->pw_dir,
1497 "u", pw->pw_name, "l", thishost, "h", host,
1498 "r", options.user, (char *)NULL);
1499 setenv(SSH_AUTHSOCKET_ENV_NAME, cp, 1);
1500 free(cp);
1501 free(p);
1502 }
1503 }
1504
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001505 /* Expand ~ in known host file names. */
Damien Miller295ee632011-05-29 21:42:31 +10001506 tilde_expand_paths(options.system_hostfiles,
1507 options.num_system_hostfiles);
1508 tilde_expand_paths(options.user_hostfiles, options.num_user_hostfiles);
Damien Miller95def091999-11-25 00:26:21 +11001509
Damien Miller07cd5892001-11-12 10:52:03 +11001510 signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
Damien Miller857b02e2010-09-24 22:02:56 +10001511 signal(SIGCHLD, main_sigchld_handler);
Damien Miller07cd5892001-11-12 10:52:03 +11001512
Darren Tuckerd6173c02008-06-13 04:52:53 +10001513 /* Log into the remote system. Never returns if the login fails. */
Damien Miller67bd0622007-09-17 12:06:57 +10001514 ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr,
Damien Millerd925dcd2010-12-01 12:21:51 +11001515 options.port, pw, timeout_ms);
Damien Miller95def091999-11-25 00:26:21 +11001516
Damien Miller383ffe62010-06-26 10:02:03 +10001517 if (packet_connection_is_on_socket()) {
1518 verbose("Authenticated to %s ([%s]:%d).", host,
djm@openbsd.org95767262016-03-07 19:02:43 +00001519 ssh_remote_ipaddr(ssh), ssh_remote_port(ssh));
Damien Miller383ffe62010-06-26 10:02:03 +10001520 } else {
1521 verbose("Authenticated to %s (via proxy).", host);
1522 }
1523
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001524 /* We no longer need the private host keys. Clear them now. */
1525 if (sensitive_data.nkeys != 0) {
1526 for (i = 0; i < sensitive_data.nkeys; i++) {
1527 if (sensitive_data.keys[i] != NULL) {
1528 /* Destroys contents safely */
1529 debug3("clear hostkey %d", i);
1530 key_free(sensitive_data.keys[i]);
1531 sensitive_data.keys[i] = NULL;
1532 }
1533 }
Darren Tuckera627d422013-06-02 07:31:17 +10001534 free(sensitive_data.keys);
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001535 }
Ben Lindstroma6c8a8d2001-08-06 21:42:00 +00001536 for (i = 0; i < options.num_identity_files; i++) {
Darren Tuckera627d422013-06-02 07:31:17 +10001537 free(options.identity_files[i]);
1538 options.identity_files[i] = NULL;
Ben Lindstroma6c8a8d2001-08-06 21:42:00 +00001539 if (options.identity_keys[i]) {
1540 key_free(options.identity_keys[i]);
1541 options.identity_keys[i] = NULL;
1542 }
1543 }
djm@openbsd.org4e44a792015-09-24 06:15:11 +00001544 for (i = 0; i < options.num_certificate_files; i++) {
1545 free(options.certificate_files[i]);
1546 options.certificate_files[i] = NULL;
1547 }
Damien Miller95def091999-11-25 00:26:21 +11001548
markus@openbsd.org8d057842016-09-30 09:19:13 +00001549 skip_connect:
djm@openbsd.orgb7548b12017-10-23 05:08:00 +00001550 exit_status = ssh_session2(ssh, pw);
Damien Miller1383bd82000-04-06 12:32:37 +10001551 packet_close();
Damien Miller8c4e18a2002-09-19 12:05:02 +10001552
Damien Millerb1cbfa22008-05-19 16:00:08 +10001553 if (options.control_path != NULL && muxserver_sock != -1)
Damien Miller0e220db2004-06-15 10:34:08 +10001554 unlink(options.control_path);
1555
Damien Millera41ccca2010-10-07 22:07:32 +11001556 /* Kill ProxyCommand if it is running. */
1557 ssh_kill_proxy_command();
Damien Miller8c4e18a2002-09-19 12:05:02 +10001558
Damien Miller1383bd82000-04-06 12:32:37 +10001559 return exit_status;
1560}
1561
Damien Millere11e1ea2010-08-03 16:04:46 +10001562static void
1563control_persist_detach(void)
1564{
1565 pid_t pid;
djm@openbsd.orgd2d6bf82016-04-29 08:07:53 +00001566 int devnull, keep_stderr;
Damien Millere11e1ea2010-08-03 16:04:46 +10001567
1568 debug("%s: backgrounding master process", __func__);
1569
djm@openbsd.orgb8bbff32018-02-13 03:36:56 +00001570 /*
1571 * master (current process) into the background, and make the
1572 * foreground process a client of the backgrounded master.
1573 */
Damien Millere11e1ea2010-08-03 16:04:46 +10001574 switch ((pid = fork())) {
1575 case -1:
1576 fatal("%s: fork: %s", __func__, strerror(errno));
1577 case 0:
1578 /* Child: master process continues mainloop */
djm@openbsd.orgb8bbff32018-02-13 03:36:56 +00001579 break;
1580 default:
Damien Millere11e1ea2010-08-03 16:04:46 +10001581 /* Parent: set up mux slave to connect to backgrounded master */
1582 debug2("%s: background process is %ld", __func__, (long)pid);
1583 stdin_null_flag = ostdin_null_flag;
Damien Miller21771e22011-05-15 08:45:50 +10001584 options.request_tty = orequest_tty;
Damien Millere11e1ea2010-08-03 16:04:46 +10001585 tty_flag = otty_flag;
djm@openbsd.orgb8bbff32018-02-13 03:36:56 +00001586 close(muxserver_sock);
1587 muxserver_sock = -1;
Damien Miller5929c522010-09-10 11:17:02 +10001588 options.control_master = SSHCTL_MASTER_NO;
djm@openbsd.orgb8bbff32018-02-13 03:36:56 +00001589 muxclient(options.control_path);
Damien Millere11e1ea2010-08-03 16:04:46 +10001590 /* muxclient() doesn't return on success. */
djm@openbsd.orgb8bbff32018-02-13 03:36:56 +00001591 fatal("Failed to connect to new control master");
1592 }
Damien Miller00d9ae22010-08-17 01:59:31 +10001593 if ((devnull = open(_PATH_DEVNULL, O_RDWR)) == -1) {
1594 error("%s: open(\"/dev/null\"): %s", __func__,
1595 strerror(errno));
1596 } else {
djm@openbsd.orgd2d6bf82016-04-29 08:07:53 +00001597 keep_stderr = log_is_on_stderr() && debug_flag;
Damien Miller00d9ae22010-08-17 01:59:31 +10001598 if (dup2(devnull, STDIN_FILENO) == -1 ||
djm@openbsd.orgd2d6bf82016-04-29 08:07:53 +00001599 dup2(devnull, STDOUT_FILENO) == -1 ||
1600 (!keep_stderr && dup2(devnull, STDERR_FILENO) == -1))
Damien Miller00d9ae22010-08-17 01:59:31 +10001601 error("%s: dup2: %s", __func__, strerror(errno));
1602 if (devnull > STDERR_FILENO)
1603 close(devnull);
1604 }
Damien Miller98e27dc2013-07-25 11:55:52 +10001605 daemon(1, 1);
Damien Millerea2c1a42011-06-03 12:10:22 +10001606 setproctitle("%s [mux]", options.control_path);
Damien Millere11e1ea2010-08-03 16:04:46 +10001607}
1608
1609/* Do fork() after authentication. Used by "ssh -f" */
1610static void
1611fork_postauth(void)
1612{
1613 if (need_controlpersist_detach)
1614 control_persist_detach();
1615 debug("forking to background");
1616 fork_after_authentication_flag = 0;
1617 if (daemon(1, 1) < 0)
1618 fatal("daemon() failed: %.200s", strerror(errno));
1619}
1620
Darren Tucker9f407c42008-06-13 04:50:27 +10001621/* Callback for remote forward global requests */
1622static void
djm@openbsd.orgdbee4112017-09-12 06:32:07 +00001623ssh_confirm_remote_forward(struct ssh *ssh, int type, u_int32_t seq, void *ctxt)
Darren Tucker9f407c42008-06-13 04:50:27 +10001624{
Damien Miller7acefbb2014-07-18 14:11:24 +10001625 struct Forward *rfwd = (struct Forward *)ctxt;
Darren Tucker9f407c42008-06-13 04:50:27 +10001626
Damien Miller4bf648f2009-02-14 16:28:21 +11001627 /* XXX verbose() on failure? */
Damien Miller4b3ed642014-07-02 15:29:40 +10001628 debug("remote forward %s for: listen %s%s%d, connect %s:%d",
Darren Tucker9f407c42008-06-13 04:50:27 +10001629 type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
Damien Miller7acefbb2014-07-18 14:11:24 +10001630 rfwd->listen_path ? rfwd->listen_path :
1631 rfwd->listen_host ? rfwd->listen_host : "",
1632 (rfwd->listen_path || rfwd->listen_host) ? ":" : "",
1633 rfwd->listen_port, rfwd->connect_path ? rfwd->connect_path :
1634 rfwd->connect_host, rfwd->connect_port);
1635 if (rfwd->listen_path == NULL && rfwd->listen_port == 0) {
Darren Tucker68afb8c2011-10-02 18:59:03 +11001636 if (type == SSH2_MSG_REQUEST_SUCCESS) {
1637 rfwd->allocated_port = packet_get_int();
1638 logit("Allocated port %u for remote forward to %s:%d",
1639 rfwd->allocated_port,
1640 rfwd->connect_host, rfwd->connect_port);
djm@openbsd.orgdbee4112017-09-12 06:32:07 +00001641 channel_update_permitted_opens(ssh,
1642 rfwd->handle, rfwd->allocated_port);
Darren Tucker68afb8c2011-10-02 18:59:03 +11001643 } else {
djm@openbsd.orgdbee4112017-09-12 06:32:07 +00001644 channel_update_permitted_opens(ssh, rfwd->handle, -1);
Darren Tucker68afb8c2011-10-02 18:59:03 +11001645 }
Damien Miller4bf648f2009-02-14 16:28:21 +11001646 }
djm@openbsd.org@openbsd.orgdbe06622017-10-27 01:57:06 +00001647
Darren Tucker9f407c42008-06-13 04:50:27 +10001648 if (type == SSH2_MSG_REQUEST_FAILURE) {
Damien Miller7acefbb2014-07-18 14:11:24 +10001649 if (options.exit_on_forward_failure) {
1650 if (rfwd->listen_path != NULL)
1651 fatal("Error: remote port forwarding failed "
1652 "for listen path %s", rfwd->listen_path);
1653 else
1654 fatal("Error: remote port forwarding failed "
1655 "for listen port %d", rfwd->listen_port);
1656 } else {
1657 if (rfwd->listen_path != NULL)
1658 logit("Warning: remote port forwarding failed "
1659 "for listen path %s", rfwd->listen_path);
1660 else
1661 logit("Warning: remote port forwarding failed "
1662 "for listen port %d", rfwd->listen_port);
1663 }
Darren Tucker9f407c42008-06-13 04:50:27 +10001664 }
Darren Tucker9a2a6092008-07-04 12:53:50 +10001665 if (++remote_forward_confirms_received == options.num_remote_forwards) {
Darren Tucker9f407c42008-06-13 04:50:27 +10001666 debug("All remote forwarding requests processed");
Damien Millere11e1ea2010-08-03 16:04:46 +10001667 if (fork_after_authentication_flag)
1668 fork_postauth();
Darren Tucker9a2a6092008-07-04 12:53:50 +10001669 }
Darren Tucker9f407c42008-06-13 04:50:27 +10001670}
1671
Ben Lindstrombba81212001-06-25 05:01:22 +00001672static void
djm@openbsd.orgdbee4112017-09-12 06:32:07 +00001673client_cleanup_stdio_fwd(struct ssh *ssh, int id, void *arg)
Darren Tucker7ad8dd22010-01-12 19:40:27 +11001674{
1675 debug("stdio forwarding: done");
1676 cleanup_exit(0);
1677}
1678
Darren Tucker2d6665d2011-11-04 10:54:22 +11001679static void
djm@openbsd.orgdbee4112017-09-12 06:32:07 +00001680ssh_stdio_confirm(struct ssh *ssh, int id, int success, void *arg)
Damien Miller357610d2014-07-18 15:04:10 +10001681{
1682 if (!success)
1683 fatal("stdio forwarding failed");
1684}
1685
1686static void
djm@openbsd.orgdbee4112017-09-12 06:32:07 +00001687ssh_init_stdio_forwarding(struct ssh *ssh)
Darren Tucker7ad8dd22010-01-12 19:40:27 +11001688{
1689 Channel *c;
Damien Millere1537f92010-01-26 13:26:22 +11001690 int in, out;
Darren Tucker7ad8dd22010-01-12 19:40:27 +11001691
dtucker@openbsd.org8543ff32016-06-03 03:14:41 +00001692 if (options.stdio_forward_host == NULL)
Darren Tucker2d6665d2011-11-04 10:54:22 +11001693 return;
Damien Millere1537f92010-01-26 13:26:22 +11001694
dtucker@openbsd.org8543ff32016-06-03 03:14:41 +00001695 debug3("%s: %s:%d", __func__, options.stdio_forward_host,
1696 options.stdio_forward_port);
Darren Tucker2d6665d2011-11-04 10:54:22 +11001697
1698 if ((in = dup(STDIN_FILENO)) < 0 ||
1699 (out = dup(STDOUT_FILENO)) < 0)
Damien Millere1537f92010-01-26 13:26:22 +11001700 fatal("channel_connect_stdio_fwd: dup() in/out failed");
djm@openbsd.orgdbee4112017-09-12 06:32:07 +00001701 if ((c = channel_connect_stdio_fwd(ssh, options.stdio_forward_host,
dtucker@openbsd.org8543ff32016-06-03 03:14:41 +00001702 options.stdio_forward_port, in, out)) == NULL)
Darren Tucker2d6665d2011-11-04 10:54:22 +11001703 fatal("%s: channel_connect_stdio_fwd failed", __func__);
djm@openbsd.orgdbee4112017-09-12 06:32:07 +00001704 channel_register_cleanup(ssh, c->self, client_cleanup_stdio_fwd, 0);
1705 channel_register_open_confirm(ssh, c->self, ssh_stdio_confirm, NULL);
Darren Tucker7ad8dd22010-01-12 19:40:27 +11001706}
1707
1708static void
djm@openbsd.orgb7548b12017-10-23 05:08:00 +00001709ssh_init_forwarding(struct ssh *ssh, char **ifname)
Damien Miller0bc1bd82000-11-13 22:57:25 +11001710{
Kevin Steves12057502001-02-05 14:54:34 +00001711 int success = 0;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001712 int i;
Kevin Steves12057502001-02-05 14:54:34 +00001713
Damien Miller0bc1bd82000-11-13 22:57:25 +11001714 /* Initiate local TCP/IP port forwardings. */
1715 for (i = 0; i < options.num_local_forwards; i++) {
Damien Millerf91ee4c2005-03-01 21:24:33 +11001716 debug("Local connections to %.200s:%d forwarded to remote "
1717 "address %.200s:%d",
Damien Miller7acefbb2014-07-18 14:11:24 +10001718 (options.local_forwards[i].listen_path != NULL) ?
1719 options.local_forwards[i].listen_path :
Darren Tucker47eede72005-03-14 23:08:12 +11001720 (options.local_forwards[i].listen_host == NULL) ?
Damien Miller7acefbb2014-07-18 14:11:24 +10001721 (options.fwd_opts.gateway_ports ? "*" : "LOCALHOST") :
Damien Millerf91ee4c2005-03-01 21:24:33 +11001722 options.local_forwards[i].listen_host,
1723 options.local_forwards[i].listen_port,
Damien Miller7acefbb2014-07-18 14:11:24 +10001724 (options.local_forwards[i].connect_path != NULL) ?
1725 options.local_forwards[i].connect_path :
Damien Millerf91ee4c2005-03-01 21:24:33 +11001726 options.local_forwards[i].connect_host,
1727 options.local_forwards[i].connect_port);
djm@openbsd.orgdbee4112017-09-12 06:32:07 +00001728 success += channel_setup_local_fwd_listener(ssh,
Damien Miller7acefbb2014-07-18 14:11:24 +10001729 &options.local_forwards[i], &options.fwd_opts);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001730 }
Darren Tuckere7d4b192006-07-12 22:17:10 +10001731 if (i > 0 && success != i && options.exit_on_forward_failure)
1732 fatal("Could not request local forwarding.");
Kevin Steves12057502001-02-05 14:54:34 +00001733 if (i > 0 && success == 0)
1734 error("Could not request local forwarding.");
Damien Miller0bc1bd82000-11-13 22:57:25 +11001735
1736 /* Initiate remote TCP/IP port forwardings. */
1737 for (i = 0; i < options.num_remote_forwards; i++) {
Damien Millerf91ee4c2005-03-01 21:24:33 +11001738 debug("Remote connections from %.200s:%d forwarded to "
1739 "local address %.200s:%d",
Damien Miller7acefbb2014-07-18 14:11:24 +10001740 (options.remote_forwards[i].listen_path != NULL) ?
1741 options.remote_forwards[i].listen_path :
Damien Miller46d38de2005-07-17 17:02:09 +10001742 (options.remote_forwards[i].listen_host == NULL) ?
Damien Milleraa3bb102005-11-05 15:12:59 +11001743 "LOCALHOST" : options.remote_forwards[i].listen_host,
Damien Millerf91ee4c2005-03-01 21:24:33 +11001744 options.remote_forwards[i].listen_port,
Damien Miller7acefbb2014-07-18 14:11:24 +10001745 (options.remote_forwards[i].connect_path != NULL) ?
1746 options.remote_forwards[i].connect_path :
Damien Millerf91ee4c2005-03-01 21:24:33 +11001747 options.remote_forwards[i].connect_host,
1748 options.remote_forwards[i].connect_port);
Darren Tucker68afb8c2011-10-02 18:59:03 +11001749 options.remote_forwards[i].handle =
djm@openbsd.orgdbee4112017-09-12 06:32:07 +00001750 channel_request_remote_forwarding(ssh,
Damien Miller7acefbb2014-07-18 14:11:24 +10001751 &options.remote_forwards[i]);
Darren Tucker68afb8c2011-10-02 18:59:03 +11001752 if (options.remote_forwards[i].handle < 0) {
Darren Tuckere7d4b192006-07-12 22:17:10 +10001753 if (options.exit_on_forward_failure)
1754 fatal("Could not request remote forwarding.");
1755 else
1756 logit("Warning: Could not request remote "
1757 "forwarding.");
Darren Tucker68afb8c2011-10-02 18:59:03 +11001758 } else {
djm@openbsd.orgdbee4112017-09-12 06:32:07 +00001759 client_register_global_confirm(
1760 ssh_confirm_remote_forward,
Darren Tucker68afb8c2011-10-02 18:59:03 +11001761 &options.remote_forwards[i]);
Darren Tuckere7d4b192006-07-12 22:17:10 +10001762 }
Damien Miller0bc1bd82000-11-13 22:57:25 +11001763 }
Damien Millerb3ce9fe2007-08-08 14:32:41 +10001764
1765 /* Initiate tunnel forwarding. */
1766 if (options.tun_open != SSH_TUNMODE_NO) {
djm@openbsd.orgb7548b12017-10-23 05:08:00 +00001767 if ((*ifname = client_request_tun_fwd(ssh,
1768 options.tun_open, options.tun_local,
1769 options.tun_remote)) == NULL) {
Damien Millerb3ce9fe2007-08-08 14:32:41 +10001770 if (options.exit_on_forward_failure)
1771 fatal("Could not request tunnel forwarding.");
1772 else
1773 error("Could not request tunnel forwarding.");
1774 }
djm@openbsd.org@openbsd.orgdbe06622017-10-27 01:57:06 +00001775 }
Damien Miller0bc1bd82000-11-13 22:57:25 +11001776}
1777
Ben Lindstrombba81212001-06-25 05:01:22 +00001778static void
Damien Miller0bc1bd82000-11-13 22:57:25 +11001779check_agent_present(void)
1780{
djm@openbsd.org141efe42015-01-14 20:05:27 +00001781 int r;
1782
Damien Miller0bc1bd82000-11-13 22:57:25 +11001783 if (options.forward_agent) {
Damien Miller788f2122005-11-05 15:14:59 +11001784 /* Clear agent forwarding if we don't have an agent. */
djm@openbsd.org141efe42015-01-14 20:05:27 +00001785 if ((r = ssh_get_authentication_socket(NULL)) != 0) {
Damien Miller0bc1bd82000-11-13 22:57:25 +11001786 options.forward_agent = 0;
djm@openbsd.org141efe42015-01-14 20:05:27 +00001787 if (r != SSH_ERR_AGENT_NOT_PRESENT)
1788 debug("ssh_get_authentication_socket: %s",
1789 ssh_err(r));
1790 }
Damien Miller0bc1bd82000-11-13 22:57:25 +11001791 }
1792}
1793
Ben Lindstrombba81212001-06-25 05:01:22 +00001794static void
djm@openbsd.orgdbee4112017-09-12 06:32:07 +00001795ssh_session2_setup(struct ssh *ssh, int id, int success, void *arg)
Damien Miller1383bd82000-04-06 12:32:37 +10001796{
Damien Miller3756dce2004-06-18 01:17:29 +10001797 extern char **environ;
Damien Miller17e7ed02005-06-17 12:54:33 +10001798 const char *display;
Damien Miller0e220db2004-06-15 10:34:08 +10001799 int interactive = tty_flag;
djm@openbsd.orged4ce822016-01-13 23:04:47 +00001800 char *proto = NULL, *data = NULL;
Damien Miller17e7ed02005-06-17 12:54:33 +10001801
Damien Millerd530f5f2010-05-21 14:57:10 +10001802 if (!success)
1803 return; /* No need for error message, channels code sens one */
1804
Damien Miller46d38de2005-07-17 17:02:09 +10001805 display = getenv("DISPLAY");
djm@openbsd.orga58be332015-04-17 13:16:48 +00001806 if (display == NULL && options.forward_x11)
1807 debug("X11 forwarding requested but DISPLAY not set");
djm@openbsd.orgdbee4112017-09-12 06:32:07 +00001808 if (options.forward_x11 && client_x11_get_proto(ssh, display,
djm@openbsd.orged4ce822016-01-13 23:04:47 +00001809 options.xauth_location, options.forward_x11_trusted,
1810 options.forward_x11_timeout, &proto, &data) == 0) {
Damien Millerbd483e72000-04-30 10:00:53 +10001811 /* Request forwarding with authentication spoofing. */
Darren Tuckerd6173c02008-06-13 04:52:53 +10001812 debug("Requesting X11 forwarding with authentication "
1813 "spoofing.");
djm@openbsd.orgdbee4112017-09-12 06:32:07 +00001814 x11_request_forwarding_with_spoofing(ssh, id, display, proto,
Damien Miller6d7b4372011-06-23 08:31:57 +10001815 data, 1);
djm@openbsd.orgdbee4112017-09-12 06:32:07 +00001816 client_expect_confirm(ssh, id, "X11 forwarding", CONFIRM_WARN);
Damien Miller6d7b4372011-06-23 08:31:57 +10001817 /* XXX exit_on_forward_failure */
Ben Lindstrombf555ba2001-01-18 02:04:35 +00001818 interactive = 1;
Damien Millerbd483e72000-04-30 10:00:53 +10001819 }
1820
Damien Miller0bc1bd82000-11-13 22:57:25 +11001821 check_agent_present();
1822 if (options.forward_agent) {
1823 debug("Requesting authentication agent forwarding.");
djm@openbsd.orgdbee4112017-09-12 06:32:07 +00001824 channel_request_start(ssh, id, "auth-agent-req@openssh.com", 0);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001825 packet_send();
1826 }
1827
Darren Tucker7b305012012-07-02 18:55:09 +10001828 /* Tell the packet module whether this is an interactive session. */
1829 packet_set_interactive(interactive,
1830 options.ip_qos_interactive, options.ip_qos_bulk);
1831
djm@openbsd.orgdbee4112017-09-12 06:32:07 +00001832 client_session2_setup(ssh, id, tty_flag, subsystem_flag, getenv("TERM"),
Damien Miller5771ed72008-05-19 15:35:33 +10001833 NULL, fileno(stdin), &command, environ);
Damien Miller1383bd82000-04-06 12:32:37 +10001834}
1835
Ben Lindstromf558cf62001-09-20 23:13:49 +00001836/* open new channel for a session */
Ben Lindstrombba81212001-06-25 05:01:22 +00001837static int
djm@openbsd.orgdbee4112017-09-12 06:32:07 +00001838ssh_session2_open(struct ssh *ssh)
Damien Miller1383bd82000-04-06 12:32:37 +10001839{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001840 Channel *c;
1841 int window, packetmax, in, out, err;
Damien Millerad833b32000-08-23 10:46:23 +10001842
Damien Millercaf6dd62000-08-29 11:33:50 +11001843 if (stdin_null_flag) {
Ben Lindstrom31ca54a2001-02-09 02:11:24 +00001844 in = open(_PATH_DEVNULL, O_RDONLY);
Damien Millercaf6dd62000-08-29 11:33:50 +11001845 } else {
1846 in = dup(STDIN_FILENO);
1847 }
1848 out = dup(STDOUT_FILENO);
1849 err = dup(STDERR_FILENO);
1850
1851 if (in < 0 || out < 0 || err < 0)
1852 fatal("dup() in/out/err failed");
1853
Damien Miller69b69aa2000-10-28 14:19:58 +11001854 /* enable nonblocking unless tty */
1855 if (!isatty(in))
1856 set_nonblock(in);
1857 if (!isatty(out))
1858 set_nonblock(out);
1859 if (!isatty(err))
1860 set_nonblock(err);
1861
Damien Millere4340be2000-09-16 13:29:08 +11001862 window = CHAN_SES_WINDOW_DEFAULT;
1863 packetmax = CHAN_SES_PACKET_DEFAULT;
Damien Miller19a59452002-02-19 15:20:57 +11001864 if (tty_flag) {
1865 window >>= 1;
1866 packetmax >>= 1;
Damien Miller1383bd82000-04-06 12:32:37 +10001867 }
djm@openbsd.orgdbee4112017-09-12 06:32:07 +00001868 c = channel_new(ssh,
Damien Miller1383bd82000-04-06 12:32:37 +10001869 "session", SSH_CHANNEL_OPENING, in, out, err,
Damien Millere4340be2000-09-16 13:29:08 +11001870 window, packetmax, CHAN_EXTENDED_WRITE,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10001871 "client-session", /*nonblock*/0);
Damien Miller1383bd82000-04-06 12:32:37 +10001872
djm@openbsd.orgdbee4112017-09-12 06:32:07 +00001873 debug3("%s: channel_new: %d", __func__, c->self);
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001874
djm@openbsd.orgdbee4112017-09-12 06:32:07 +00001875 channel_send_open(ssh, c->self);
Ben Lindstromf558cf62001-09-20 23:13:49 +00001876 if (!no_shell_flag)
djm@openbsd.orgdbee4112017-09-12 06:32:07 +00001877 channel_register_open_confirm(ssh, c->self,
Damien Millerb84886b2008-05-19 15:05:07 +10001878 ssh_session2_setup, NULL);
Damien Miller1383bd82000-04-06 12:32:37 +10001879
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001880 return c->self;
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001881}
1882
Ben Lindstrombba81212001-06-25 05:01:22 +00001883static int
djm@openbsd.orgb7548b12017-10-23 05:08:00 +00001884ssh_session2(struct ssh *ssh, struct passwd *pw)
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001885{
djm@openbsd.org4d5456c2017-10-25 00:21:37 +00001886 int devnull, id = -1;
djm@openbsd.orgb7548b12017-10-23 05:08:00 +00001887 char *cp, *tun_fwd_ifname = NULL;
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001888
1889 /* XXX should be pre-session */
Darren Tucker2d6665d2011-11-04 10:54:22 +11001890 if (!options.control_persist)
djm@openbsd.orgdbee4112017-09-12 06:32:07 +00001891 ssh_init_stdio_forwarding(ssh);
djm@openbsd.orgb7548b12017-10-23 05:08:00 +00001892
1893 ssh_init_forwarding(ssh, &tun_fwd_ifname);
1894
1895 if (options.local_command != NULL) {
1896 debug3("expanding LocalCommand: %s", options.local_command);
1897 cp = options.local_command;
1898 options.local_command = percent_expand(cp,
1899 "C", conn_hash_hex,
1900 "L", shorthost,
1901 "d", pw->pw_dir,
1902 "h", host,
1903 "l", thishost,
1904 "n", host_arg,
1905 "p", portstr,
1906 "r", options.user,
1907 "u", pw->pw_name,
1908 "T", tun_fwd_ifname == NULL ? "NONE" : tun_fwd_ifname,
1909 (char *)NULL);
1910 debug3("expanded LocalCommand: %s", options.local_command);
1911 free(cp);
1912 }
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001913
Damien Millere11e1ea2010-08-03 16:04:46 +10001914 /* Start listening for multiplex clients */
markus@openbsd.org8d057842016-09-30 09:19:13 +00001915 if (!packet_get_mux())
djm@openbsd.orgdbee4112017-09-12 06:32:07 +00001916 muxserver_listen(ssh);
Damien Millere11e1ea2010-08-03 16:04:46 +10001917
djm@openbsd.orgb8bbff32018-02-13 03:36:56 +00001918 /*
Darren Tucker2d6665d2011-11-04 10:54:22 +11001919 * If we are in control persist mode and have a working mux listen
1920 * socket, then prepare to background ourselves and have a foreground
1921 * client attach as a control slave.
1922 * NB. we must save copies of the flags that we override for
Damien Millere11e1ea2010-08-03 16:04:46 +10001923 * the backgrounding, since we defer attachment of the slave until
1924 * after the connection is fully established (in particular,
1925 * async rfwd replies have been received for ExitOnForwardFailure).
1926 */
djm@openbsd.orgb8bbff32018-02-13 03:36:56 +00001927 if (options.control_persist && muxserver_sock != -1) {
Damien Millere11e1ea2010-08-03 16:04:46 +10001928 ostdin_null_flag = stdin_null_flag;
1929 ono_shell_flag = no_shell_flag;
Damien Miller21771e22011-05-15 08:45:50 +10001930 orequest_tty = options.request_tty;
Damien Millere11e1ea2010-08-03 16:04:46 +10001931 otty_flag = tty_flag;
djm@openbsd.orgb8bbff32018-02-13 03:36:56 +00001932 stdin_null_flag = 1;
1933 no_shell_flag = 1;
1934 tty_flag = 0;
Damien Millere11e1ea2010-08-03 16:04:46 +10001935 if (!fork_after_authentication_flag)
1936 need_controlpersist_detach = 1;
1937 fork_after_authentication_flag = 1;
djm@openbsd.orgb8bbff32018-02-13 03:36:56 +00001938 }
Darren Tucker2d6665d2011-11-04 10:54:22 +11001939 /*
1940 * ControlPersist mux listen socket setup failed, attempt the
1941 * stdio forward setup that we skipped earlier.
1942 */
1943 if (options.control_persist && muxserver_sock == -1)
djm@openbsd.orgdbee4112017-09-12 06:32:07 +00001944 ssh_init_stdio_forwarding(ssh);
Damien Millere11e1ea2010-08-03 16:04:46 +10001945
djm@openbsd.org14b5c632018-01-23 05:27:21 +00001946 if (!no_shell_flag)
djm@openbsd.orgdbee4112017-09-12 06:32:07 +00001947 id = ssh_session2_open(ssh);
Damien Miller649fe022013-07-18 16:13:55 +10001948 else {
1949 packet_set_interactive(
1950 options.control_master == SSHCTL_MASTER_NO,
1951 options.ip_qos_interactive, options.ip_qos_bulk);
1952 }
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001953
Darren Tucker8901fa92008-06-11 09:34:01 +10001954 /* If we don't expect to open a new session, then disallow it */
Damien Miller456e6f02008-11-03 19:20:10 +11001955 if (options.control_master == SSHCTL_MASTER_NO &&
1956 (datafellows & SSH_NEW_OPENSSH)) {
Darren Tucker8901fa92008-06-11 09:34:01 +10001957 debug("Requesting no-more-sessions@openssh.com");
1958 packet_start(SSH2_MSG_GLOBAL_REQUEST);
1959 packet_put_cstring("no-more-sessions@openssh.com");
1960 packet_put_char(0);
1961 packet_send();
1962 }
1963
Damien Millerd27b9472005-12-13 19:29:02 +11001964 /* Execute a local command */
1965 if (options.local_command != NULL &&
1966 options.permit_local_command)
1967 ssh_local_cmd(options.local_command);
1968
Damien Miller1f25ab42010-07-16 13:56:23 +10001969 /*
djm@openbsd.org4d5456c2017-10-25 00:21:37 +00001970 * stdout is now owned by the session channel; clobber it here
1971 * so future channel closes are propagated to the local fd.
1972 * NB. this can only happen after LocalCommand has completed,
1973 * as it may want to write to stdout.
1974 */
djm@openbsd.org@openbsd.org939b30b2017-11-01 00:04:15 +00001975 if (!need_controlpersist_detach) {
1976 if ((devnull = open(_PATH_DEVNULL, O_WRONLY)) == -1)
1977 error("%s: open %s: %s", __func__,
1978 _PATH_DEVNULL, strerror(errno));
1979 if (dup2(devnull, STDOUT_FILENO) < 0)
1980 fatal("%s: dup2() stdout failed", __func__);
1981 if (devnull > STDERR_FILENO)
1982 close(devnull);
1983 }
djm@openbsd.org4d5456c2017-10-25 00:21:37 +00001984
1985 /*
Damien Miller1f25ab42010-07-16 13:56:23 +10001986 * If requested and we are not interested in replies to remote
1987 * forwarding requests, then let ssh continue in the background.
1988 */
Damien Millere11e1ea2010-08-03 16:04:46 +10001989 if (fork_after_authentication_flag) {
1990 if (options.exit_on_forward_failure &&
1991 options.num_remote_forwards > 0) {
1992 debug("deferring postauth fork until remote forward "
1993 "confirmation received");
1994 } else
1995 fork_postauth();
Darren Tucker9a2a6092008-07-04 12:53:50 +10001996 }
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001997
djm@openbsd.orgdbee4112017-09-12 06:32:07 +00001998 return client_loop(ssh, tty_flag, tty_flag ?
Ben Lindstrom2b1f71b2001-06-05 20:32:21 +00001999 options.escape_char : SSH_ESCAPECHAR_NONE, id);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002000}
Damien Miller0bc1bd82000-11-13 22:57:25 +11002001
djm@openbsd.org4e44a792015-09-24 06:15:11 +00002002/* Loads all IdentityFile and CertificateFile keys */
Ben Lindstrombba81212001-06-25 05:01:22 +00002003static void
djm@openbsd.orgb7548b12017-10-23 05:08:00 +00002004load_public_identity_files(struct passwd *pw)
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00002005{
djm@openbsd.orgb7548b12017-10-23 05:08:00 +00002006 char *filename, *cp;
markus@openbsd.org54d90ac2017-05-30 08:52:19 +00002007 struct sshkey *public;
djm@openbsd.org4e44a792015-09-24 06:15:11 +00002008 int i;
2009 u_int n_ids, n_certs;
Damien Miller0a80ca12010-02-27 07:55:05 +11002010 char *identity_files[SSH_MAX_IDENTITY_FILES];
markus@openbsd.org54d90ac2017-05-30 08:52:19 +00002011 struct sshkey *identity_keys[SSH_MAX_IDENTITY_FILES];
djm@openbsd.org4e44a792015-09-24 06:15:11 +00002012 char *certificate_files[SSH_MAX_CERTIFICATE_FILES];
2013 struct sshkey *certificates[SSH_MAX_CERTIFICATE_FILES];
Damien Miller7ea845e2010-02-12 09:21:02 +11002014#ifdef ENABLE_PKCS11
markus@openbsd.org54d90ac2017-05-30 08:52:19 +00002015 struct sshkey **keys;
Damien Miller7ea845e2010-02-12 09:21:02 +11002016 int nkeys;
Damien Miller0a80ca12010-02-27 07:55:05 +11002017#endif /* PKCS11 */
Ben Lindstrom0936a5b2002-03-26 03:17:42 +00002018
djm@openbsd.org4e44a792015-09-24 06:15:11 +00002019 n_ids = n_certs = 0;
Damien Miller1d2c4562014-02-04 11:18:20 +11002020 memset(identity_files, 0, sizeof(identity_files));
2021 memset(identity_keys, 0, sizeof(identity_keys));
djm@openbsd.org4e44a792015-09-24 06:15:11 +00002022 memset(certificate_files, 0, sizeof(certificate_files));
2023 memset(certificates, 0, sizeof(certificates));
Damien Miller0a80ca12010-02-27 07:55:05 +11002024
2025#ifdef ENABLE_PKCS11
Damien Miller7ea845e2010-02-12 09:21:02 +11002026 if (options.pkcs11_provider != NULL &&
Ben Lindstrom0936a5b2002-03-26 03:17:42 +00002027 options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
Damien Miller7ea845e2010-02-12 09:21:02 +11002028 (pkcs11_init(!options.batch_mode) == 0) &&
2029 (nkeys = pkcs11_add_provider(options.pkcs11_provider, NULL,
2030 &keys)) > 0) {
Damien Miller7ea845e2010-02-12 09:21:02 +11002031 for (i = 0; i < nkeys; i++) {
Damien Miller0a80ca12010-02-27 07:55:05 +11002032 if (n_ids >= SSH_MAX_IDENTITY_FILES) {
2033 key_free(keys[i]);
2034 continue;
2035 }
2036 identity_keys[n_ids] = keys[i];
2037 identity_files[n_ids] =
Damien Miller7ea845e2010-02-12 09:21:02 +11002038 xstrdup(options.pkcs11_provider); /* XXX */
Damien Miller0a80ca12010-02-27 07:55:05 +11002039 n_ids++;
Ben Lindstrom0936a5b2002-03-26 03:17:42 +00002040 }
Darren Tuckera627d422013-06-02 07:31:17 +10002041 free(keys);
Ben Lindstrom711b04a2001-08-06 21:12:42 +00002042 }
Damien Miller7ea845e2010-02-12 09:21:02 +11002043#endif /* ENABLE_PKCS11 */
Damien Miller6b1d53c2006-03-31 23:13:21 +11002044 if ((pw = getpwuid(original_real_uid)) == NULL)
2045 fatal("load_public_identity_files: getpwuid failed");
Damien Miller0a80ca12010-02-27 07:55:05 +11002046 for (i = 0; i < options.num_identity_files; i++) {
Darren Tucker15fd19c2013-04-05 11:22:26 +11002047 if (n_ids >= SSH_MAX_IDENTITY_FILES ||
2048 strcasecmp(options.identity_files[i], "none") == 0) {
Darren Tuckera627d422013-06-02 07:31:17 +10002049 free(options.identity_files[i]);
djm@openbsd.org4e44a792015-09-24 06:15:11 +00002050 options.identity_files[i] = NULL;
Damien Miller0a80ca12010-02-27 07:55:05 +11002051 continue;
2052 }
Damien Miller6b1d53c2006-03-31 23:13:21 +11002053 cp = tilde_expand_filename(options.identity_files[i],
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00002054 original_real_uid);
djm@openbsd.orgb7548b12017-10-23 05:08:00 +00002055 filename = percent_expand(cp, "d", pw->pw_dir,
2056 "u", pw->pw_name, "l", thishost, "h", host,
Damien Miller6b1d53c2006-03-31 23:13:21 +11002057 "r", options.user, (char *)NULL);
Darren Tuckera627d422013-06-02 07:31:17 +10002058 free(cp);
Ben Lindstromd0fca422001-03-26 13:44:06 +00002059 public = key_load_public(filename, NULL);
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00002060 debug("identity file %s type %d", filename,
2061 public ? public->type : -1);
Darren Tuckera627d422013-06-02 07:31:17 +10002062 free(options.identity_files[i]);
Damien Miller0a80ca12010-02-27 07:55:05 +11002063 identity_files[n_ids] = filename;
2064 identity_keys[n_ids] = public;
2065
2066 if (++n_ids >= SSH_MAX_IDENTITY_FILES)
2067 continue;
2068
djm@openbsd.org4e44a792015-09-24 06:15:11 +00002069 /*
2070 * If no certificates have been explicitly listed then try
2071 * to add the default certificate variant too.
2072 */
2073 if (options.num_certificate_files != 0)
2074 continue;
Damien Miller0a80ca12010-02-27 07:55:05 +11002075 xasprintf(&cp, "%s-cert", filename);
2076 public = key_load_public(cp, NULL);
2077 debug("identity file %s type %d", cp,
2078 public ? public->type : -1);
2079 if (public == NULL) {
Darren Tuckera627d422013-06-02 07:31:17 +10002080 free(cp);
Damien Miller0a80ca12010-02-27 07:55:05 +11002081 continue;
2082 }
2083 if (!key_is_cert(public)) {
2084 debug("%s: key %s type %s is not a certificate",
2085 __func__, cp, key_type(public));
2086 key_free(public);
Darren Tuckera627d422013-06-02 07:31:17 +10002087 free(cp);
Damien Miller0a80ca12010-02-27 07:55:05 +11002088 continue;
2089 }
djm@openbsd.orgb4867e02016-12-06 07:48:01 +00002090 /* NB. leave filename pointing to private key */
2091 identity_files[n_ids] = xstrdup(filename);
Damien Miller0a80ca12010-02-27 07:55:05 +11002092 identity_keys[n_ids] = public;
Damien Miller0a80ca12010-02-27 07:55:05 +11002093 n_ids++;
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00002094 }
djm@openbsd.org4e44a792015-09-24 06:15:11 +00002095
2096 if (options.num_certificate_files > SSH_MAX_CERTIFICATE_FILES)
2097 fatal("%s: too many certificates", __func__);
2098 for (i = 0; i < options.num_certificate_files; i++) {
2099 cp = tilde_expand_filename(options.certificate_files[i],
2100 original_real_uid);
djm@openbsd.orgb7548b12017-10-23 05:08:00 +00002101 filename = percent_expand(cp, "d", pw->pw_dir,
2102 "u", pw->pw_name, "l", thishost, "h", host,
djm@openbsd.org4e44a792015-09-24 06:15:11 +00002103 "r", options.user, (char *)NULL);
2104 free(cp);
2105
2106 public = key_load_public(filename, NULL);
2107 debug("certificate file %s type %d", filename,
2108 public ? public->type : -1);
2109 free(options.certificate_files[i]);
2110 options.certificate_files[i] = NULL;
2111 if (public == NULL) {
2112 free(filename);
2113 continue;
2114 }
2115 if (!key_is_cert(public)) {
2116 debug("%s: key %s type %s is not a certificate",
2117 __func__, filename, key_type(public));
2118 key_free(public);
2119 free(filename);
2120 continue;
2121 }
2122 certificate_files[n_certs] = filename;
2123 certificates[n_certs] = public;
2124 ++n_certs;
2125 }
2126
Damien Miller0a80ca12010-02-27 07:55:05 +11002127 options.num_identity_files = n_ids;
2128 memcpy(options.identity_files, identity_files, sizeof(identity_files));
2129 memcpy(options.identity_keys, identity_keys, sizeof(identity_keys));
2130
djm@openbsd.org4e44a792015-09-24 06:15:11 +00002131 options.num_certificate_files = n_certs;
2132 memcpy(options.certificate_files,
2133 certificate_files, sizeof(certificate_files));
2134 memcpy(options.certificates, certificates, sizeof(certificates));
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00002135}
Damien Miller857b02e2010-09-24 22:02:56 +10002136
2137static void
2138main_sigchld_handler(int sig)
2139{
2140 int save_errno = errno;
2141 pid_t pid;
2142 int status;
2143
2144 while ((pid = waitpid(-1, &status, WNOHANG)) > 0 ||
2145 (pid < 0 && errno == EINTR))
2146 ;
Damien Miller857b02e2010-09-24 22:02:56 +10002147 errno = save_errno;
2148}